Name: Atmel AVR XMEGA AU series
Brand: Atmel
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478

8331B–AVR–03/12

Atmel AVR XMEGA AU

36.11 SDRAM init

Figure 36-35. SDRAM init

Mode Register

CLK

CKE

CAS

RAS

DQM

BA[1:0]

A[11:0]

0x400

Precharge All Banks

Auto Refresh**

Load Mode Register

NOP*

* The number of NOPs is equal to RPDLY[2:0] (RPDLY = 1 is shown)

NOP**

** The Auto Refresh and following NOPs are repeated 8 times

The number of NOPs is equal to ROWCYCDLY[2:0] (ROWCYCDLY = 1 is shown)

Clk

PER2

1 About the Manual2
- Reading the Manual2
- Resources2
- Recommended Reading2
2 Overview3
3 Avr Cpu7
- Features7
- Overview7
- Architectural Overview7
- ALU - Arithmetic Logic Unit8
- Program Flow9
- Instruction Execution Timing9
- Status Register10
- Stack and Stack Pointer10
- Register File11
- RAMP and Extended Indirect Registers12
- Accessing 16-Bit Registers13
- Configuration Change Protection13
- Fuse Lock14
- Register Descriptions15
- Register Summary19
4 Memories20
- Features20
- Overview20
- Flash Program Memory21
- Fuses and Lockbits22
- Data Memory23
- Internal SRAM23
- Eeprom23
- I/O Memory24
- External Memory24
- Data Memory and Bus Arbitration24
- Memory Timing25
- Device ID and Revision25
- JTAG Disable25
- I/O Memory Protection25
- Register Description - NVM Controller26
- Register Descriptions - Fuses and Lock Bits31
- Register Description - Production Signature Row37
- Register Description - General Purpose I/O Memory46
- Register Description - External Memory46
- Register Descriptions - MCU Control47
- Register Summary - NVM Controller51
- Register Summary - Fuses and Lockits51
- Register Summary - Production Signature Row52
- Register Summary - General Purpose I/O Registers53
- Register Summary - MCU Control53
- Interrupt Vector Summary - NVM Controller53
5 DMAC - Direct Memory Access Controller54
- Features54
- Overview54
- DMA Transaction55
- Transfer Triggers56
- Addressing56
- Priority between Channels56
- Double Buffering57
- Transfer Buffers57
- Error Detection57
- Software Reset57
- Protection57
- Interrupts58
- Register Description - DMA Controller59
- Register Description - DMA Channel61
- Register Summary - DMA Controller70
- Register Summary - DMA Channel70
- DMA Interrupt Vector Summary70
6 Event System71
- Features71
- Overview71
- Events72
- Event Routing Network74
- Event Timing76
- Filtering76
- Quadrature Decoder76
- Register Description78
- Register Summary82
7 System Clock and Clock Options83
- Features83
- Overview83
- Clock Distribution85
- Clock Sources85
- System Clock Selection and Prescalers87
- PLL with 1X-31X Multiplication Factor88
- DFLL 2Mhz and DFLL 32Mhz89
- PLL and External Clock Source Failure Monitor90
- Register Description - Clock92
- Register Description - Oscillator96
- Register Description - DFLL32M/DFLL2M101
- Register Summary - Clock104
- Register Summary - Oscillator104
- Register Summary - DFLL32M/DFLL2M104
- Oscillator Failure Interrupt Vector Summary104
8 Power Management and Sleep Modes105
- Features105
- Overview105
- Sleep Modes105
- Power Reduction Registers107
- Minimizing Power Consumption107
- Register Description - Sleep109
- Register Description - Power Reduction109
- Register Summary - Sleep112
- Register Summary - Power Reduction112
9 Reset System113
- Features113
- Overview113
- Reset Sequence114
- Reset Sources115
- Register Description119
- Register Summary120
10 Battery Backup System121
- Features121
- Overview121
- Battery Backup System122
- Configuration123
- Operation123
- Register Description125
- Register Summary127
11 WDT - Watchdog Timer128
- Features128
- Overview128
- Normal Mode Operation128
- Window Mode Operation129
- Watchdog Timer Clock129
- Configuration Protection and Lock130
- Registers Description130
- Register Summary133
12 Interrupts and Programmable Multilevel Interrupt Controller134
- Features134
- Overview134
- Operation134
- Interrupts135
- Interrupt Level138
- Interrupt Priority138
- Interrupt Vector Locations140
- Register Description141
- Register Summary142
13 O Ports143
- Features143
- Overview143
- I/O Pin Use and Configuration144
- Reading the Pin Value147
- Input Sense Configuration148
- Port Interrupt149
- Port Event150
- Alternate Port Functions150
- Slew Rate Control151
- Clock and Event Output151
- Multi-Pin Configuration152
- Virtual Ports152
- Register Descriptions - Ports153
- Register Descriptions - Port Configuration159
- Register Descriptions - Virtual Port164
- Register Summary - Ports166
- Register Summary - Port Configuration166
- Register Summary - Virtual Ports166
- Interrupt Vector Summary - Ports167
14 TC0/1 - 16-Bit Timer/Counter Type 0 and 1168
- Features168
- Overview168
- Block Diagram170
- Clock and Event Sources171
- Double Buffering171
- Counter Operation172
- Capture Channel175
- Compare Channel177
- Interrupts and Events181
- DMA Support181
- Timer/Counter Commands181
- Register Description182
- Register Summary192
- Interrupt Vector Summary192
15 TC2 - 16-Bit Timer/Counter Type 2193
- Features193
- Overview193
- Clock Sources194
- Counter Operation195
- Compare Channel196
- Interrupts and Events197
- DMA Support198
- Timer/Counter Commands198
- Register Description199
- Register Summary205
- Interrupt Vector Summary205
16 Awex - Advanced Waveform Extension206
- Features206
- Overview206
- Port Override207
- Dead-Time Insertion208
- Pattern Generation209
- Fault Protection210
- Register Description212
- Register Summary216
17 Hi-Res - High-Resolution Extension217
- Features217
- Overview217
- Register Description218
- Register Summary218
18 RTC - Real-Time Counter219
- Features219
- Overview219
- Register Descriptions221
- Register Summary226
- Interrupt Vector Summary226
19 RTC32 - 32-Bit Real-Time Counter227
- Features227
- Overview227
- Register Descriptions229
- Register Summary234
- Interrupt Vector Summary234
20 USB - Universal Serial Bus Interface235
- Features235
- Overview235
- Operation237
- SRAM Memory Mapping240
- Clock Generation241
- Ping-Pong Operation242
- Multipacket Transfers243
- Auto Zero Length Packet244
- Transaction Complete FIFO244
- Interrupts and Events245
- VBUS Detection247
- On-Chip Debug247
- Register Description - USB248
- Register Description - USB Endpoint255
- Register Description - Frame260
- Register Summary - USB Module261
- Register Summary - USB Endpoint261
- Register Summary - Frame261
- USB Interrupt Vector Summary261
21 TWI - Two-Wire Interface262
- Features262
- Overview262
- General TWI Bus Concepts263
- TWI Bus State Logic268
- TWI Master Operation269
- TWI Slave Operation271
- Enabling External Driver Interface273
- Register Description - TWI274
- Register Description - TWI Master275
- Register Description - TWI Slave280
- Register Summary - TWI286
- Register Summary - TWI Master286
- Register Summary - TWI Slave286
- Interrupt Vector Summary286
22 SPI - Serial Peripheral Interface287
- Features287
- Overview287
- Master Mode288
- Slave Mode288
- Data Modes289
- DMA Support289
- Register Description290
- Register Summary292
- Interrupt Vector Summary292
23 Usart293
- Features293
- Overview293
- Clock Generation295
- Frame Formats298
- USART Initialization299
- Data Transmission - the USART Transmitter299
- Data Reception - the USART Receiver300
- Asynchronous Data Reception301
- Fractional Baud Rate Generation304
- USART in Master SPI Mode307
- USART SPI Vs. SPI307
- Multiprocessor Communication Mode307
- IRCOM Mode of Operation308
- DMA Support308
- Register Description309
- Register Summary315
- Interrupt Vector Summary315
24 IRCOM - IR Communication Module316
- Features316
- Overview316
- Registers Description318
- Register Summary319
25 AES and des Crypto Engines320
- Features320
- Overview320
- DES Instruction320
- AES Crypto Module321
- Register Description - AES324
- Register Summary - AES327
- Interrupt Vector Summary - AES327
26 CRC - Cyclic Redundancy Check Generator328
- Features328
- Overview328
- Operation329
- CRC on Flash Memory329
- CRC on DMA Data330
- CRC Using the I/O Interface330
- Register Description331
- Register Sumary334
27 EBI - External Bus Interface335
- Features335
- Overview335
- Chip Select335
- EBI Clock337
- SRAM Configuration337
- SRAM LPC Configuration339
- SDRAM Configuration340
- Combined SRAM & SDRAM Configuration342
- I/O Pin and Pin-Out Configuration343
- Register Description - EBI346
- Register Description - EBI Chip Select351
- Register Summary - EBI355
- Register Summary - EBI Chip Select355
28 ADC - Analog-To-Digital Converter356
- Features356
- Overview356
- Input Sources357
- ADC Channels360
- Voltage Reference Selection361
- Conversion Result361
- Compare Function363
- Starting a Conversion363
- ADC Clock and Conversion Timing363
- ADC Input Model367
- DMA Transfer368
- Interrupts and Events368
- Calibration368
- Channel Priority368
- Synchronous Sampling369
- Register Description - ADC370
- Register Description - ADC Channel377
- Register Summary - ADC384
- Register Summary - ADC Channel384
- Interrupt Vector Summary385
29 DAC - Digital to Analog Converter386
- Features386
- Overview386
- Voltage Reference Selection387
- Starting a Conversion387
- Output and Output Channels387
- DAC Output Model387
- DAC Clock388
- Low Power Mode388
- Calibration388
- Register Description390
- Register Summary397
30 AC - Analog Comparator398
- Features398
- Overview398
- Input Sources399
- Signal Compare399
- Interrupts and Events399
- Window Mode400
- Input Hysteresis400
- Propagation Delay Vs. Power Consumption400
- Register Description401
- Register Summary407
- Interrupt Vector Summary407
31 IEEE 1149.1 JTAG Boundary Scan Interface408
- Features408
- Overview408
- TAP - Test Access Port408
- JTAG Instructions410
- Boundary Scan Chain412
- Data Registers413
32 Program and Debug Interface415
- Features415
- Overview415
- PDI Physical416
- JTAG Physical420
- PDI Controller423
- Register Description - PDI Instruction and Addressing Registers427
- Register Description - PDI Control and Status Registers429
- Register Summary430
33 Memory Programming431
- Features431
- Overview431
- NVM Controller432
- NVM Commands432
- NVM Controller Busy Status432
- Flash and EEPROM Page Buffers433
- Flash and EEPROM Programming Sequences434
- Protection of NVM435
- Preventing NVM Corruption435
- CRC Functionality435
- Self-Programming and Boot Loader Support435
- External Programming446
- Register Description452
- Register Summary452
34 Peripheral Module Address Map453
35 Instruction Set Summary456
36 Appendix A: EBI Timing Diagrams461
- SRAM 3-Port ALE1 CS461
- SRAM 3-Port ALE12 CS463
- SRAM 4-Port ALE2 CS466
- SRAM 4- Port NOALE CS468
- LPC 2- Port ALE12 CS469
- LPC 3- Port ALE1 CS471
- LPC 2- Port ALE1 CS472
- SRAM 3- Port ALE1 no CS473
- SRAM 4- Port NOALE no CS475
- LPC 2- Port ALE12 no CS476
- SDRAM Init478
- SDRAM 8-Bit Write479
- SDRAM 8-Bit Read483
- SDRAM 4-Bit Write487
- SDRAM 4-Bit Read491
- SRAM Refresh494
37 Datasheet Revision History498

Atmel AVR XMEGA AU series User Manual

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Atmel AVR XMEGA AU series Specifications

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Brand	Atmel
Model	AVR XMEGA AU series
Category	Microcontrollers
Language	English