T89C51AC2-SLSIM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'T89C51AC2-SLSIM' PDF : 121 Pages View PDF
Table 38. PCON Register
PCON (S:87h)
Power Control 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
GF1 Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
General-purpose Flag
GF0 Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
Power-Down mode bit
PD Cleared by hardware when reset occurs.
Set to enter power-down mode.
Idle mode bit
IDL Clear by hardware when interrupt or reset occurs.
Set to enter idle mode.
Reset Value = 00X1 0000b
Not bit addressable
56 A/T89C51AC2
4127H–8051–02/08
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