AT80C51RA2-3CSCV View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT80C51RA2-3CSCV' PDF : 86 Pages View PDF
AT/TS8xC51Rx2
Bit
Bit
Number Mnemonic Description
7
SMOD1
Serial port Mode bit 1
Set to select double baud rate in mode 1, 2 or 3.
Serial port Mode bit 0
6
SMOD0 Clear to select SM0 bit in SCON register.
Set to to select FE bit in SCON register.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Power-Off Flag
4
POF
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
3
GF1
Cleared by user for general purpose usage.
Set by user for general purpose usage.
General purpose Flag
2
GF0
Cleared by user for general purpose usage.
Set by user for general purpose usage.
Power-Down mode bit
1
PD
Cleared by hardware when reset occurs.
Set to enter power-down mode.
Idle mode bit
0
IDL
Clear 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.
39
4188F–8051–01/08
Share Link: 
