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6. If the TDRE flag is 1, the TEND flag in SSR is set to 1, the stop bit is sent, and then the “mark
state” is entered, in which 1 is output. If the TEIE bit in SCR is set to 1 at this time, a TEI
interrupt request is generated.
TDRE
TEND
0
1 frame
D0
D1
D7
0/1
1
0
D0
D1
D7
0/1
1
1
1
Data
Start
bit
Parity
bit
Stop
bit
Start
bit
Data
Parity
bit
Stop
bit
TXI interrupt
request generated
Data written to TDR and
TDRE flag cleared to 0 in
TXI interrupt service routine
TEI interrupt
request generated
Idle state
(mark state)
TXI interrupt
request generated
Figure 13.9 Example of Operation in Transmission in Asynchronous Mode
(Example with 8-Bit Data, Parity, One Stop Bit)
Summary of Contents for H8S/2215 Series
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