Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 48)

48 Rev.A - May 17, 2001

Preliminary

T89C51CC02

11.5. REGISTERS

SCON (S:98h)

Serial Control Register

Reset Value = 0000 0000b

Bit addressable

Figure 29. SCON Register

7 6 5 4 3 2 1 0

FE/SM0 SM1 SM2 REN TB8 RB8 TI RI

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.

SM0

Serial port Mode bit 0 (SMOD0=0)

Refer to SM1 for serial port mode selection.

6 SM1

Serial port Mode bit 1

SM0 SM1 ModeBaud Rate

0 0 Shift RegisterF

XTAL

/12

0 1 8-bit UARTVariable

1 0 9-bit UARTF

XTAL

/64 or F

XTAL

/32

1 1 9-bit UARTVariable

5 SM2

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.

4 REN

Reception Enable bit

Clear to disable serial reception.

Set to enable serial reception.

3 TB8

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.

2 RB8

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.

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 27. and Figure 28. in the other modes.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 136 137

T89C51CC02 1

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics T89C51CC02 Manual de usuario Pagina 48

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics T89C51CC02