Rainbow-electronics T89C51CC01 Manual do Utilizador descarregar pdf (Página 50)

T89C51CC01

Rev. D – 17-Dec-01

For slaves A and B, bit 2 is a don’t care bit; for slave C, bit 2 is set. To communicate with

all of the slaves, the master must send an address FFh. To communicate with slaves A

and B, but not slave C, the master can send and address FBh.

11.5 Registers Table 15. SCON Register

SCON (S:98h)

Serial Control Register

Reset Value = 0000 0000b

Bit addressable

76543210

FE/SM0 SM1 SM2 REN TB8 RB8 TI RI

Bit

Number

Bit

Mnemonic Description

7FE

Framing Error bit (SMOD0=1)

Cleartoresettheerrorstate,notclearedbyavalidstopbit.

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.

6SM1

Serial port Mode bit 1

SM0

SM1 Mode Baud Rate

0 0 Shift Register F

XTAL

/12 (or F

XTAL

/6 in mode X2)

0 1 8-bit UART Variable

10 9-bitUARTF

XTAL

/64 or F

XTAL

/32

1 1 9-bit UART Variable

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.

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.

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 20. and

Figure 21. in the other modes.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 148 149

T89C51CC01 1

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