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Section 15 Serial Communication Interface with FIFO
Page 756 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Figure 15.5 shows an example of the operation for transmission.
TDFE
0
0/1
1
1 1
D
0
D
1
D
7
0
0/1
1D
0
D
1
D
7
TEND
Serial
data
Start
bit
Data
Parity
bit
Stop
bit
Start
bit
Idle state
(mark state)
Data
Parity
bit
Stop
bit
TXI interrupt
request
Data written to SCFTDR and TDFE
flag read as 1 then cleared to 0 by
TXI interrupt handler
One frame
TXI interrupt
request
Figure 15.5 Example of Transmit Operation
(8-Bit Data, Parity, 1 Stop Bit)
4. When modem control is enabled in channel 1 on the SH7262, and channels 1 and 3 on the
SH7264, transmission can be stopped and restarted in accordance with the CTS input value.
When CTS is set to 1, if transmission is in progress, the line goes to the mark state after
transmission of one frame. When CTS is set to 0, the next transmit data is output starting from
the start bit.
Figure 15.6 shows an example of the operation when modem control is used.
CTS
0
0/1
D
0
D
1
D
7
0
0/1
D
0
D
1
D
7
Serial data
TxD
Drive high before stop bit
Start
bit
Parity
bit
Stop
bit
Start
bit
Figure 15.6 Example of Operation Using Modem Control (CTS)