RTC System
UG0331 User Guide Revision 15.0 601
18 RTC System
The SmartFusion2 real-time counter (RTC) system keeps track of seconds, minutes, hours, days, weeks,
and years.
18.1 Features
It has two modes of operation:
• Real-time Calendar: Counts seconds, minutes, hours, days, week, months, and years
• Binary Counter: Consecutively counts from 0 to 243
As shown in the following figure, the RTC is connected to the AHB bus matrix through the APB_1
interface.
Figure 254 • Microcontroller Subsystem Showing RTC
AHB Bus Matrix
eSRAM_0
System
Controller
Cache
Controller
SD IC
ARM Cortex-M3
Processor
SDI
MSS DDR
Bridge
PDMA
MS6
MM3
AHB To AHB Bridge with Address Decoder
USB OTG
HPDMA
MDDR
APB_0
SYSREG
Triple Speed
Ethernet MAC
FIC_0
MM4 MS4
MS2 MS3 MS0
MS5
MS1
MM5 MM6
MM7
MM8
MM2 MM1 MM0 MM9
IDC
D/S
eNVM_0 eNVM_1 eSRAM_1
FIC_2 (Peripheral
Initialization)
APB_1
MMUART_0
SPI_0
I2C_0
PDMA
Configuration
WATCHDOG
FIIC
TIMERx2
MMUART_1
SPI_1
I2C_1
GPIO
CAN
RTC
COMM_BLK
FIC_1
MSS_FIC
MS6_USB
MS5_MAC MS5_SR MS5_APB0 MS5_FIC2 MS5_APB1
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