W79E225A Datasheet, PDF (1/200 Pages) Winbond – 8-bit Microcontroller

PRELIMINARY W79E225A/227A DATA SHEET
8-bit Microcontroller
Table of Contents-
1. GENERAL DESCRIPTION ......................................................................................................... 5
2. FEATURES ................................................................................................................................. 6
3. PARTS INFORMATION LIST ..................................................................................................... 7
3.1 Lead Free (RoHS) Parts information list......................................................................... 7
4. PIN CONFIGURATION ............................................................................................................... 8
5. PIN DESCRIPTION................................................................................................................... 10
5.1 Port 4 ............................................................................................................................ 12
6. MEMORY ORGANIZATION...................................................................................................... 13
6.1 Program Memory (on-chip Flash) ................................................................................. 13
6.2 Data Memory ................................................................................................................ 13
6.3 Auxiliary SRAM ............................................................................................................. 14
6.4 NVM Data Flash Memory ............................................................................................. 14
6.4.1 Operation........................................................................................................................19
7. SPECIAL FUNCTION REGISTERS ......................................................................................... 21
8. INSTRUCTION SET.................................................................................................................. 74
8.1 Instruction Timing.......................................................................................................... 82
8.1.1 External Data Memory Access Timing............................................................................84
9. POWER MANAGEMENT.......................................................................................................... 87
9.1 Idle Mode ...................................................................................................................... 87
9.2 Power Down Mode ....................................................................................................... 87
10. RESET CONDITIONS............................................................................................................... 89
10.1 Sources of reset............................................................................................................ 89
10.1.1 External Reset ..............................................................................................................89
10.1.2 Power-On Reset (POR)................................................................................................89
10.1.3 Watchdog Timer Reset.................................................................................................89
10.2 Reset State ................................................................................................................... 90
11. INTERRUPTS ........................................................................................................................... 91
11.1 Interrupt Sources .......................................................................................................... 91
11.2 Priority Level Structure ................................................................................................. 91
11.2.1 Response Time ............................................................................................................95
12. PROGRAMMABLE TIMERS/COUNTERS ............................................................................... 96
12.1 Timer/Counters 0 & 1.................................................................................................... 96
12.1.1 Time-Base Selection ....................................................................................................96
12.1.2 Mode 0 .........................................................................................................................96
12.1.3 Mode 1 .........................................................................................................................97
12.1.4 Mode 2 .........................................................................................................................97
12.1.5 Mode 3 .........................................................................................................................98
Publication Release Date: December 14, 2007
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Revision A2.0