AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 25
AT89C51RD2
Manufacturer Part Number
AT89C51RD2
Description
Manufacturer
Atmel Corporation
Specifications of AT89C51RD2
Flash (kbytes)
64 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
32
Spi
1
Uart
1
Sram (kbytes)
2
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART
Watchdog
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51RD2-3CSIM
Manufacturer:
ATMEL
Quantity:
1 080
Company:
Part Number:
AT89C51RD2-CM
Manufacturer:
IR
Quantity:
11
Part Number:
AT89C51RD2-CM
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT89C51RD2-IM
Manufacturer:
AT
Quantity:
5
Part Number:
AT89C51RD2-IM
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT89C51RD2-RDTUM
Manufacturer:
MICRON
Quantity:
1 000
4235K–8051–05/08
Reset Value = 0X00 1000
Not bit addressable
Number
Bit
1
0
Mnemonic
EXTRAM
Bit
AO
Description
EXTRAM bit
Cleared to access internal XRAM using movx @ Ri/ @ DPTR.
Set to access external memory.
Programmed by hardware after Power-up regarding Hardware Security Byte (HSB),
default setting, XRAM selected.
ALE Output bit
Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if X2
mode is used). (default) Set, ALE is active only during a MOVX or MOVC instruction is
used.
AT89C51RD2/ED2
25