at89c51ac3-s3sim ATMEL Corporation, at89c51ac3-s3sim Datasheet - Page 34

• Manufacturer Part Number: at89c51ac3-s3sim
• Description: At89c51ac3 Enhanced 8-bit Microcontroller With 64kb Flash Memory
• Manufacturer: ATMEL Corporation

Registers
34
AT89C51AC3
Table 10. PCON Register
PCON (S87:h) Power configuration Register
Reset Value= XXXX 0000b
Number
Bit
7-4
7
-
3
2
1
0
Mnemonic Description
GF1
GF0
Bit
IDL
PD
6
-
-
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
GF0
2
4383D–8051–02/08
PD
1
IDL
0