Datasheet
Table Of Contents
- Features
- Description
- Block Diagram
- SFR Mapping
- Pin Configurations
- Oscillators
- Enhanced Features
- Dual Data Pointer Register DPTR
- Expanded RAM (XRAM)
- Reset
- Power Monitor
- Timer 2
- Programmable Counter Array PCA
- Serial I/O Port
- Interrupt System
- Power Management
- Keyboard Interface
- 2-wire Interface (TWI)
- Serial Port Interface (SPI)
- Hardware Watchdog Timer
- ONCE(TM) Mode (ON Chip Emulation)
- Power-off Flag
- EEPROM Data Memory
- Reduced EMI Mode
- Flash Memory
- Electrical Characteristics
- Absolute Maximum Ratings
- DC Parameters
- AC Parameters
- Explanation of the AC Symbols
- External Program Memory Characteristics
- External Program Memory Read Cycle
- External Data Memory Characteristics
- External Data Memory Write Cycle
- External Data Memory Read Cycle
- Serial Port Timing - Shift Register Mode
- Shift Register Timing Waveforms
- External Clock Drive Waveforms
- AC Testing Input/Output Waveforms
- Float Waveforms
- Clock Waveforms
- Ordering Information
- Packaging Information
- Table of Contents
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AT89C51ID2
4289C–8051–11/05
Table 11. Two-Wire Interface Controller SFRs
MnemonicAddName 76543210
SSCON 93h Synchronous Serial control SSCR2 SSPE SSSTA SSSTO SSI SSAA SSCR1 SSCR0
SSCS 94h Synchronous Serial Status SSC4 SSC3 SSC2 SSC1 SSC0 0 0 0
SSDAT 95h Synchronous Serial Data SSD7 SSD6 SSD5 SSD4 SSD3 SSD2 SSD1 SSD0
SSADR 96h Synchronous Serial Address SSA7 SSA6 SSA5 SSA4 SSA3 SSA2 SSA1 SSGC
Table 12. Keyboard Interface SFRs
MnemonicAddName 76543210
KBLS 9Ch Keyboard Level Selector KBLS7 KBLS6 KBLS5 KBLS4 KBLS3 KBLS2 KBLS1 KBLS0
KBE 9Dh Keyboard Input Enable KBE7 KBE6 KBE5 KBE4 KBE3 KBE2 KBE1 KBE0
KBF 9Eh Keyboard Flag Register KBF7 KBF6 KBF5 KBF4 KBF3 KBF2 KBF1 KBF0
Table 13. EEPROM data Memory SFR
MnemonicAddName 76543210
EECON D2h EEPROM Data Control EEE EEBUSY