AT89C51RD2-SLSIM Atmel, AT89C51RD2-SLSIM Datasheet - Page 82

• Manufacturer Part Number: AT89C51RD2-SLSIM
• Description: IC 8051 MCU FLASH 64K 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RD2-SLSIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

82
AT89C51RD2/ED2
Note:
Note:
Table 18-1.
Reset
Idle (internal
code)
Idle (external
code)
Power-Down
(internal
code)
Power-Down
(external
code)
3. Generate an enabled external Keyboard interrupt (same behavior as external interrupt).
Mode
continue for a number of clock cycles before the internal reset algorithm takes
control. Reset initializes the AT89C51RD2/ED2 and vectors the CPU to address
0000h.
During the time that execution resumes, the internal RAM cannot be accessed; however, it is pos-
sible for the Port pins to be accessed. To avoid unexpected outputs at the Port pins, the instruction
immediately following the instruction that activated the Power-Down mode should not write to a
Port pin or to the external RAM.
Exit from power-down by reset redefines all the
content.
Pin Conditions in Special Operating Modes
Floating
Floating
Floating
Port 0
Data
Data
Port 1
High
Data
Data
Data
Data
Port 2
High
Data
Data
Data
Data
SFRs
Port 3
High
Data
Data
Data
Data
, but does not affect the internal RAM
Port 4
High
Data
Data
Data
Data
High
High
High
ALE
Low
Low
4235K–8051–05/08
PSEN#
High
High
High
Low
Low