Rainbow-electronics T89C5115 Manual de usuario Pagina 47

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T89C5115
4128A–8051–04/02
Table 30. PCON Register
PCON (S:87h)
Power Control Register
Reset Value = 00x1 0000b
Not bit addressable
76543210
SMOD1 SMOD0 - POF GF1 GF0 PD IDL
Bit
Number
Bit
Mnemonic Description
7SMOD1
Serial port Mode bit 1
Settoselectdoublebaudrateinmode1,2or3.
6SMOD0
Serial port Mode bit 0
Clear to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
5-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4POF
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.
3GF1
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
2GF0
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
1PD
Power-down mode bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
0IDL
Idle mode bit
Clear by hardware when interrupt or reset occurs.
Set to enter idle mode.
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