AT80C51RA2-RLSIV datasheet(38/85 Pages) IRF

38 / 85 page

4188E–8051–08/06

AT/TS8xC51Rx2

Reset Value = 0000 0000b

Bit addressable

Table 6-15.

PCON Register

PCON - Power Control Register (87h)

Bit Number

Bit

Mnemonic

Description

7FE

Framing Error bit (SMOD0=1)

Clear to reset the error state, not cleared by a valid stop bit.

Set by hardware when an invalid stop bit is detected.

SMOD0 must be set to enable access to the FE bit

SM0

Serial port Mode bit 0

Refer to SM1 for serial port mode selection.

SMOD0 must be cleared to enable access to the SM0 bit

6SM1

Serial port Mode bit 1

SM0 SM1ModeDescriptionBaud Rate

0Shift RegisterFXTAL/12 (/6 in X2 mode)

18-bit UARTVariable

1029-bit UARTFXTAL/64 or FXTAL/32 (/32, /16 in X2 mode)

39-bit UARTVariable

5SM2

Serial port Mode 2 bit / Multiprocessor Communication Enable bit

Clear to disable multiprocessor communication feature.

Set to enable multiprocessor communication feature in mode 2 and 3, and eventually

mode 1. This bit should be cleared in mode 0.

4REN

Reception Enable bit

Clear to disable serial reception.

Set to enable serial reception.

3TB8

Transmitter Bit 8 / Ninth bit to transmit in modes 2 and 3

Clear to transmit a logic 0 in the 9th bit.

Set to transmit a logic 1 in the 9th bit.

2RB8

Receiver Bit 8 / Ninth bit received in modes 2 and 3

Cleared by hardware if 9th bit received is a logic 0.

Set by hardware if 9th bit received is a logic 1.

In mode 1, if SM2 = 0, RB8 is the received stop bit. In mode 0 RB8 is not used.

1TI

Transmit Interrupt flag

Clear to acknowledge interrupt.

Set by hardware at the end of the 8th bit time in mode 0 or at the beginning of the stop

bit in the other modes.

0RI

Receive Interrupt flag

Clear to acknowledge interrupt.

Set by hardware at the end of the 8th bit time in mode 0, see Figure 6-11. and Figure 6-

12. in the other modes.

543

210

SMOD1

SMOD0

POF

GF1

GF0

IDL

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