AT89C51RC2-3CSCM(2003) View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89C51RC2-3CSCM Datasheet PDF : 125 Pages
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AT89C51RB2/RC2
Table 41. PCON Register
PCON - Power Control Register (87h)
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 for UART
Set to select double baud rate in mode 1, 2 or 3.
SMOD0
Serial port Mode Bit 0 for UART
Cleared 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
Cleared 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
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.
Reset Value = 00X1 0000b
Not bit addressable
Power-off flag reset value will be 1 only after a power on (cold reset). A warm reset
doesn’t affect the value of this bit.
51
4180B–8051–04/03
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