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
67
AT89C51ID2
4289C–8051–11/05
Table 51. IPH0 Register
IPH0 - Interrupt Priority High Register (B7h)
Reset Value = X000 0000b
Not bit addressable
76543210
- PPCH PT2H PSH PT1H PX1H PT0H PX0H
Bit
Number
Bit
Mnemonic Description
7-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6 PPCH
PCA interrupt Priority high bit.
PPCHPPCLPriority Level
0 0Lowest
01
10
1 1Highest
5PT2H
Timer 2 overflow interrupt Priority High bit
PT2HPT2LPriority Level
0 0Lowest
01
10
1 1Highest
4 PSH
Serial port Priority High bit
PSH PSLPriority Level
0 0Lowest
0 1
1 0
1 1Highest
3PT1H
Timer 1 overflow interrupt Priority High bit
PT1HPT1L Priority Level
00 Lowest
01
10
11 Highest
2 PX1H
External interrupt 1 Priority High bit
PX1HPX1LPriority Level
0 0Lowest
01
10
1 1Highest
1PT0H
Timer 0 overflow interrupt Priority High bit
PT0HPT0LPriority Level
0 0Lowest
0 1
10
1 1Highest
0 PX0H
External interrupt 0 Priority High bit
PX0H PX0LPriority Level
0 0Lowest
01
10
1 1Highest