Renesas M16C Series User Manual page 78

M30245 Group
Example of wiring
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Example of operation
BRGi's count
source
Receive enable
bit
RxD
i
Transfer clock
Receive
complete flag
RTS
i
Receive interrupt
request bit
Figure 2.4.10. Operation timing of reception in UART mode
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Microcomputer
R Di
X
RTSi
(1) Reception enabled
(2) Start reception
"1"
"0"
Start bit
Sampled "L"
Reception started when transfer
clock is generated by falling edge
of start bit
"1"
"0"
"H"
"L"
"1"
"0"
Cleared to "0" when interrupt request is accepted, or cleared by software
Timing of transfer data 8 bits long applies to the following settings :
•Transfer data length is 8 bits.
•Parity is disabled.
•One stop bit
•RTS function is selected.
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Transmitter side IC
T D
X
Port
D D
D
1 7
0
Receive data taken in
Transferred from UARTi receive register
to UARTi receive buffer register
Becomes "L" by reading the receive buffer
2. UART
(4) Data is
read
(3) Receiving is
completed
Stop bit