Intel 8XC251SA User Manual

CONTENTS
xiii
TABLES
Table Page
1-1 Intel Application Support Services................................................................................1-7
2-1 8XC251SA, SB, SP, SQ Features................................................................................2-3
3-1 Address Mappings........................................................................................................3-4
3-2 Minimum Times to Fetch Two Bytes of Code...............................................................3-9
3-3 Register Bank Selection.............................................................................................3-12
3-4 Dedicated Registers in the Register File and their Corresponding SFRs...................3-15
3-5 8XC251SA, SB, SP, SQ SFR Map and Reset Values ...............................................3-17
3-6 Core SFRs..................................................................................................................3-18
3-7 I/O Port SFRs.............................................................................................................3-18
3-8 Serial I/O SFRs ..........................................................................................................3-19
3-9 Timer/Counter and Watchdog Timer SFRs................................................................3-19
3-10 Programmable Counter Array (PCA) SFRs................................................................3-19
4-1 External Addresses for Configuration Array.................................................................4-4
4-2 Memory Signal Selections (RD1:0) ..............................................................................4-8
4-3 RD#, WR#, PSEN# External Wait States...................................................................4-13
4-4 Examples of Opcodes in Binary and Source Modes..................................................4-14
5-1 Data Types...................................................................................................................5-2
5-2 Notation for Byte Registers, Word Registers, and Dword Registers............................5-3
5-3 Addressing Modes for Data Instructions in the MCS® 51 Architecture........................5-6
5-4 Addressing Modes for Data Instructions in the MCS® 251 Architecture......................5-7
5-5 Bit-addressable Locations..........................................................................................5-11
5-6 Addressing Two Sample Bits......................................................................................5-12
5-7 Addressing Modes for Bit Instructions........................................................................5-12
5-8 Addressing Modes for Control Instructions.................................................................5-13
5-9 Compare-conditional Jump Instructions.....................................................................5-14
5-10 The Effects of Instructions on the PSW and PSW1 Flags..........................................5-17
6-1 Interrupt System Pin Signals........................................................................................6-1
6-2 Interrupt System Special Function Registers ...............................................................6-3
6-3 Interrupt Control Matrix.................................................................................................6-4
6-4 Level of Priority.............................................................................................................6-7
6-5 Interrupt Priority Within Level .......................................................................................6-7
6-6 Interrupt Latency Variables ........................................................................................6-13
6-7 Actual vs. Predicted Latency Calculations..................................................................6-13
7-1 Input/Output Port Pin Descriptions...............................................................................7-1
7-2 Instructions for External Data Moves............................................................................7-9
8-1 Timer/Counter and Watchdog Timer SFRs..................................................................8-2
8-2 External Signals ...........................................................................................................8-3
8-3 Timer 2 Modes of Operation.......................................................................................8-15
9-1 PCA Special Function Registers (SFRs)......................................................................9-4
9-2 External Signals ...........................................................................................................9-4
9-3 PCA Module Modes ...................................................................................................9-14
10-1 Serial Port Signals......................................................................................................10-1
10-2 Serial Port Special Function Registers.......................................................................10-2
10-3 Summary of Baud Rates ..........................................................................................10-10

Intel 8XC251SA Specifications

General

Brand	Intel
Model	8XC251SA
Category	Microcontrollers
Language	English