AT89C51RC2-3CSIM datasheet(125/127 Pages) ATMEL

125 / 127 page

4180C–8051–12/03

Registers............................................................................................................. 47

Baud Rate Selection for UART for Mode 1 and 3............................................... 47

UART Registers.................................................................................................. 50

Interrupt System ................................................................................. 55

Registers............................................................................................................. 56

Interrupt Sources and Vector Addresses............................................................ 63

Keyboard Interface ............................................................................. 64

Registers............................................................................................................. 65

Serial Port Interface (SPI) ................................................................... 68

Features.............................................................................................................. 68

Signal Description............................................................................................... 68

Functional Description ........................................................................................ 70

Hardware Watchdog Timer ................................................................ 77

Using the WDT ................................................................................................... 77

WDT During Power-down and Idle ..................................................................... 78

ONCE™ Mode (ON Chip Emulation) .................................................. 79

Power Management ............................................................................ 80

Reset .................................................................................................................. 80

Reset Recommendation to Prevent Flash Corruption ........................................ 82

Idle Mode ............................................................................................................ 82

Power-down Mode.............................................................................................. 82

Power-off Flag ..................................................................................... 84

Reduced EMI Mode ............................................................................. 85

Flash EEPROM Memory ..................................................................... 86

Features.............................................................................................................. 86

Flash Programming and Erasure ........................................................................ 86

Flash Registers and Memory Map...................................................................... 87

Flash Memory Status.......................................................................................... 90

Memory Organization ......................................................................................... 90

Bootloader Architecture ...................................................................................... 91

ISP Protocol Description..................................................................................... 95

Functional Description ........................................................................................ 96

Flow Description ................................................................................................. 97

API Call Description.......................................................................................... 105

Electrical Characteristics ................................................................. 107

Absolute Maximum Ratings .............................................................................. 107

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