AT89C51ID2 Atmel Corporation, AT89C51ID2 Datasheet - Page 75

• Manufacturer Part Number: AT89C51ID2
• Manufacturer: Atmel Corporation

Specifications of AT89C51ID2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 2
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Registers
75
AT89C51ID2
Table 58. PCON Register
PCON (S87:h) Power configuration Register
Reset Value= XXXX 0000b
Number
Bit
7-5
7
-
4
3
2
1
0
Mnemonic Description
POF
GF1
GF0
Bit
IDL
PD
6
-
-
Reserved
The value read from these bits is indeterminate. Do not set these bits.
Power-Off Flag
Cleared to recognize next reset type.
Set by hardware when VCC rises from 0 to its nominal voltage. Can also be set
by software.
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
-
POF
4
GF1
3
GF0
2
PD
1
4289C–8051–11/05
IDL
0