AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 83

• Manufacturer Part Number: AT89C51RD2
• 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

18.4
4235K–8051–05/08
Registers
Table 18-2.
Reset Value= XXXX 0000b
Bit Number
7-4
7
3
2
1
0
-
Mnemonic
PCON Register
PCON (S87:h) Power configuration Register
GF1
GF0
IDL
PD
Bit
6
-
-
Description
Reserved
The value read from these bits is indeterminate. Do not set these bits.
General Purpose flag 1
One use is to indicate whether an interrupt occurred during normal operation or during
Idle mode.
General Purpose flag 0
One use is to indicate whether an interrupt occurred during normal operation or during
Idle mode.
Power-Down Mode bit
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Power-Down mode.
If IDL and PD are both set, PD takes precedence.
Idle Mode bit
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Idle mode.
If IDL and PD are both set, PD takes precedence.
5
-
4
-
GF1
3
AT89C51RD2/ED2
GF0
2
PD
1
IDL
0
83