參數(shù)資料
型號: T89C51RB2-SLSCM
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-bit Microcontroller with 16 Kbytes/ 32 Kbytes FLASH
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 58/170頁
文件大?。?/td> 1927K
代理商: T89C51RB2-SLSCM
58
A/T89C51CC01
4129L–CAN–08/05
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.
Registers
Table 35.
SCON Register
SCON (S:98h)
Serial Control Register
Reset Value = 0000 0000b
Bit addressable
7
6
5
4
3
2
1
0
FE/SM0
SM1
SM2
REN
TB8
RB8
TI
RI
Bit
Number
Bit
Mnemonic
Description
7
FE
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 Mode
0
0
0
1
1
0
1
1
Baud Rate
F
XTAL
/12 (or F
XTAL
/6 in mode X2)
Variable
F
XTAL
/64 or F
XTAL
/32
Variable
Shift Register
8-bit UART
9-bit UART
9-bit UART
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.
1
TI
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.
0
RI
Receive Interrupt flag
Clear to acknowledge interrupt.
Set by hardware at the end of the 8th bit time in mode 0, see Figure 29. and
Figure 30. in the other modes.
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