at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 135

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

2
AT89C51RD2/ED2
14 Serial I/O Port ......................................................................................... 48
15 Keyboard Interface ................................................................................ 59
16 Serial Port Interface (SPI) ...................................................................... 63
17 Interrupt System .................................................................................... 72
18 Power Management ............................................................................... 80
19 Hardware Watchdog Timer ................................................................... 84
20 ONCE
21 Power-off Flag ........................................................................................ 87
22 Reduced EMI Mode ................................................................................ 88
23 EEPROM Data Memory .......................................................................... 89
24 Flash/EEPROM Memory ........................................................................ 93
14.1
14.2
14.3
14.4
14.5
15.1
16.1
16.2
16.3
17.1
17.2
18.1
18.2
18.3
18.4
19.1
19.2
23.1
23.2
23.3
24.1
24.2
®
Mode (ON- Chip Emulation) ..................................................... 86
Framing Error Detection .................................................................................. 48
Automatic Address Recognition ...................................................................... 49
Registers ......................................................................................................... 51
Baud Rate Selection for UART for Mode 1 and 3............................................ 51
UART Registers............................................................................................... 54
Registers ......................................................................................................... 60
Features .......................................................................................................... 63
Signal Description............................................................................................ 63
Functional Description ..................................................................................... 65
Registers ......................................................................................................... 73
Interrupt Sources and Vector Addresses......................................................... 73
Introduction...................................................................................................... 80
Idle Mode......................................................................................................... 80
Power-Down Mode .......................................................................................... 81
Registers ......................................................................................................... 83
Using the WDT ................................................................................................ 84
WDT during Power-down and Idle................................................................... 85
Write Data........................................................................................................ 89
Read Data ....................................................................................................... 90
Registers ......................................................................................................... 91
Features .......................................................................................................... 93
Flash Programming and Erasure..................................................................... 93
4235J–8051–01/08