Rainbow Electronics AT89C51SND1C - Manual (Page 50)

50
AT8xC51SND1C
4109E–8051–06/03
Registers Table 59. PCON Register
PCON (S:87h) – Power Configuration Register
Reset Value = XXXX 0000b
7 6 5 4 3 2 1 0
- - - - GF1 GF0 PD IDL
Bit
Number
Bit
Mnemonic Description
7 - 4 -
Reserved
The value read from these bits is indeterminate. Do not set these bits.
3 GF1
General-purpose flag 1
One use is to indicate whether an interrupt occurred during normal operation or
during Idle mode.
2 GF0
General-purpose flag 0
One use is to indicate whether an interrupt occurred during normal operation or
during Idle mode.
1 PD
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.
0 IDL
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.