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参数资料
| 型号： | ST7PL38F2MC/XXXE |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-20 |
| 文件页数： | 159/168页 |
| 文件大小： | 2955K |
| 代理商： | ST7PL38F2MC/XXXE |
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Obsolete
Product(s)
- Obsolete
Product(s)
ST7L34, ST7L35, ST7L38, ST7L39
90/168
LINSCI
SERIAL COMMUNICATION INTERFACE (SCI Mode) (cont’d)
11.5.5.2 Transmitter
The transmitter can send data words of either 8 or
9 bits depending on the M bit status. When the M
bit is set, word length is 9 bits and the 9th bit (the
MSB) has to be stored in the T8 bit in the SCICR1
register.
Character Transmission
During an SCI transmission, data shifts out least
significant bit first on the TDO pin. In this mode,
the SCIDR register consists of a buffer (TDR) be-
tween the internal bus and the transmit shift regis-
ter (see Figure 55).
Procedure
– Select the M bit to define the word length.
– Select the desired baud rate using the SCIBRR
and the SCIETPR registers.
– Set the TE bit to send a preamble of 10 (M = 0)
or 11 (M = 1) consecutive ones (Idle Line) as first
transmission.
– Access the SCISR register and write the data to
send in the SCIDR register (this sequence clears
the TDRE bit). Repeat this sequence for each
data to be transmitted.
Clearing the TDRE bit is always performed by the
following software sequence:
1. An access to the SCISR register
2. A write to the SCIDR register
The TDRE bit is set by hardware and it indicates:
– The TDR register is empty.
– The data transfer is beginning.
– The next data can be written in the SCIDR regis-
ter without overwriting the previous data.
This flag generates an interrupt if the TIE bit is set
and the I[|1:0] bits are cleared in the CCR register.
When a transmission is taking place, a write in-
struction to the SCIDR register stores the data in
the TDR register and which is copied in the shift
register at the end of the current transmission.
When no transmission is taking place, a write in-
struction to the SCIDR register places the data di-
rectly in the shift register, the data transmission
starts, and the TDRE bit is immediately set.
When a character transmission is complete (after
the stop bit) the TC bit is set and an interrupt is
generated if the TCIE is set and the I[1:0] bits are
cleared in the CCR register.
Clearing the TC bit is performed by the following
software sequence:
1. An access to the SCISR register
2. A write to the SCIDR register
Note: The TDRE and TC bits are cleared by the
same software sequence.
Break Characters
Setting the SBK bit loads the shift register with a
break character. The break character length de-
pends on the M bit (see Figure 56).
As long as the SBK bit is set, the SCI sends break
characters to the TDO pin. After clearing this bit by
software, the SCI inserts a logic 1 bit at the end of
the last break character to guarantee the recogni-
tion of the start bit of the next character.
Idle Line
Setting the TE bit drives the SCI to send a pream-
ble of 10 (M = 0) or 11 (M = 1) consecutive ‘1’s
(idle line) before the first character.
In this case, clearing and then setting the TE bit
during a transmission sends a preamble (idle line)
after the current word. Note that the preamble du-
ration (10 or 11 consecutive ‘1’s depending on the
M bit) does not take into account the stop bit of the
previous character.
Note: Resetting and setting the TE bit causes the
data in the TDR register to be lost. Therefore the
best time to toggle the TE bit is when the TDRE bit
is set, that is, before writing the next byte in the
SCIDR.
1
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相关代理商/技术参数 |
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