AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 125

• Manufacturer Part Number: AT89C51RB2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RB2

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 1.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

xxxxA–8051–10/06
Interrupt System ................................................................................. 55
Keyboard Interface ............................................................................. 64
Serial Port Interface (SPI) ................................................................... 68
Hardware Watchdog Timer ................................................................ 77
ONCE
Power Management ............................................................................ 80
Power-off Flag ..................................................................................... 84
Reduced EMI Mode ............................................................................. 85
Flash EEPROM Memory ..................................................................... 86
Electrical Characteristics ................................................................. 107
Registers............................................................................................................. 47
Baud Rate Selection for UART for Mode 1 and 3............................................... 47
UART Registers.................................................................................................. 50
Registers............................................................................................................. 56
Interrupt Sources and Vector Addresses............................................................ 63
Registers............................................................................................................. 65
Features.............................................................................................................. 68
Signal Description............................................................................................... 68
Functional Description ........................................................................................ 70
Using the WDT ................................................................................................... 77
WDT During Power-down and Idle ..................................................................... 78
Reset .................................................................................................................. 80
Reset Recommendation to Prevent Flash Corruption ........................................ 82
Idle Mode ............................................................................................................ 82
Power-down Mode.............................................................................................. 82
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
Absolute Maximum Ratings .............................................................................. 107
™
Mode (ON Chip Emulation) .................................................. 79
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