参数资料
型号: ST72F60E1M1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO24
封装: 0.300 INCH, LEAD FREE, PLASTIC, SOP-24
文件页数: 125/139页
文件大小: 1993K
代理商: ST72F60E1M1
Serial communications interface (SCI)
ST7260xx
86/139
13.3.4
Data register (SCIDR)
Contains the Received or Transmitted data character, depending on whether it is read from
or written to.
The Data register performs a double function (read and write) since it is composed of two
registers, one for transmission (TDR) and one for reception (RDR).
The TDR register provides the parallel interface between the internal bus and the output
shift register (see Figure 38).
The RDR register provides the parallel interface between the input shift register and the
internal bus (see Figure 38).
3TE
Transmitter Enable
This bit enables the transmitter. It is set and cleared by software.
0: Transmitter is disabled
1: Transmitter is enabled
Notes:
- During transmission, a ‘0’ pulse on the TE bit (‘0’ followed by ‘1’) sends a preamble
(Idle line) after the current word.
- When TE is set there is a 1 bit-time delay before the transmission starts.
Caution: The TDO pin is free for general purpose I/O only when the TE and RE bits
are both cleared (or if TE is never set).
2RE
Receiver Enable
This bit enables the receiver. It is set and cleared by software.
0: Receiver is disabled
1: Receiver is enabled and begins searching for a start bit
Note: Before selecting Mute mode (setting the RWU bit), the SCI must first receive
some data, otherwise it cannot function in Mute mode with Wake-Up by Idle line
detection.
1RWU
Receiver Wake-Up
This bit determines if the SCI is in mute mode or not. It is set and cleared by
software and can be cleared by hardware when a wake-up sequence is recognized.
0: Receiver in Active mode
1: Receiver in Mute mode
0SBK
Send Break
This bit set is used to send break characters. It is set and cleared by software.
0: No break character is transmitted.
1: Break characters are transmitted.
Note: If the SBK bit is set to ‘1’ and then to ‘0’, the transmitter will send a Break word
at the end of the current word.
Table 40.
SCICR2 register description (continued)
Bit
Name
Function
SCIDR
Reset value:
undefined (xxh)
76
543
21
0
DR7
DR6
DR5
DR4
DR3
DR2
DR1
DR0
R/W
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