Registers
Table 61. PCON Register
PCON (S:87h) – Power Configuration Register
7
6
5
-
4
-
3
2
1
0
SMOD1
SMOD0
GF1
GF0
PD
IDL
Bit
Bit
Number
Mnemonic Description
Serial Port Mode Bit 1
Set to select double baud rate in mode 1,2 or 3.
7
6
SMOD1
Serial Port Mode Bit 0
SMOD0 Set to select FE bit in SCON register.
Clear to select SM0 bit in SCON register.
Reserved
5 - 4
3
-
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.
GF1
GF0
General-Purpose Flag 0
One use is to indicate whether an interrupt occurred during normal operation or
during Idle mode.
2
1
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.
PD
Idle Mode Bit
Cleared by hardware when an interrupt or reset occurs.
Set to activate the Idle mode.
0
IDL
If IDL and PD are both set, PD takes precedence.
Reset Value = 00XX 0000b
50
AT8xC51SND2C
4341D–MP3–04/05
ATMEL [ ATMEL ]
