89C51IC2-CM ATMEL [ATMEL Corporation], 89C51IC2-CM Datasheet - Page 16
89C51IC2-CM
Manufacturer Part Number
89C51IC2-CM
Description
8-bit Flash Microcontroller with 2-wire Interface
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.89C51IC2-CM.pdf
(146 pages)
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16
AT89C51IC2
Table 17. PCON Register
PCON - Power Control Register (87h)
Reset Value = 00X1 0000b
Not bit addressable
Number
SMOD1
Bit
7
7
6
5
4
3
2
1
0
Mnemonic Description
SMOD0
SMOD1
SMOD0
POF
GF1
GF0
Bit
IDL
PD
6
-
Serial port Mode bit 1
Set to select double baud rate in mode 1, 2 or 3.
Serial port Mode bit 0
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.
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
Cleared by software for general purpose usage.
Set by software for general purpose usage.
General purpose Flag
Cleared by software for general purpose usage.
Set by software for general purpose usage.
Power-Down mode bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
Idle mode bit
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.
5
-
POF
4
GF1
3
GF0
2
PD
1
4301A–8051–01/04
IDL
0
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