T89C51AC2-SLSIM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'T89C51AC2-SLSIM' PDF : 121 Pages View PDF
Registers
Table 15. PCON Register
PCON (S:87h) – Power configuration Register
7
6
5
SMOD1 SMOD0
-
4
3
2
1
0
POF
GF1
GF0
PD
IDL
Bit
Number
7
6
5
4
3
2
1
0
Bit
Mnemonic Description
SMOD1
Serial port Mode bit 1
Set to select double baud rate in mode 1, 2 or 3
SMOD0
Serial port Mode bit 0
Clear to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
POF
Power-Off Flag
Clear 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
GF1 One use is to indicate whether an interrupt occurred during normal operation or
during Idle mode.
General-purpose flag 0
GF0 One use is to indicate whether an interrupt occurred during normal operation or
during Idle mode.
Power-down Mode bit
PD
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
IDL
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.
Reset Value = 00X1 0000b
22 A/T89C51AC2
4127H–8051–02/08
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