T84C5112-RKSCL datasheet(37/97 Pages) ATMEL

37 / 97 page

Rev. B - November 10, 2000

Preliminary

T80C5112

Table 18. SCON Register

SCON - Serial Control Register for UART (98h)

Reset Value = 0000 0000b

Bit addressable

FE/SM0

SM1

SM2

REN

TB8

RB8

Bit Number

Bit

Mnemonic

Description

Framing Error bit (SMOD0=1) for UART

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 (SMOD0=0) for UART

Refer to SM1 for serial port mode selection.

SMOD0 must be cleared to enable access to the SM0 bit

SM1

Serial port Mode bit 1 for UART

SM0

SM1

ModeDescriptionBaud Rate

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

18-bit UARTVariable

29-bit UARTFXTAL/64 or FXTAL/32 (FXTAL/32 or FXTAL/16 X2 mode)

39-bit UARTVariable

SM2

Serial port Mode 2 bit / Multiprocessor Communication Enable bit for UART

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.

REN

Reception Enable bit for UART

Clear to disable serial reception.

Set to enable serial reception.

TB8

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

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

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

RB8

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

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.

Transmit Interrupt ﬂag for UART

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.

Receive Interrupt ﬂag for UART

Clear to acknowledge interrupt.

Set by hardware at the end of the 8th bit time in mode 0, see Figure 11. and Figure 12. in the other modes.

T84C5112-RKSCL Datasheet(PDF) 37 Page - ATMEL Corporation

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