AT89C51RC2-3CSCM(2003) 查看數據表（PDF） - Atmel Corporation

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AT89C51RC2-3CSCM
(Rev.:2003)

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

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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