M38203M4 Datasheet, PDF (198/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.5 Serial I/O1
(2) Clock asynchronous serial I/O1 (UART) mode
As the clock asynchronous mode (UART mode), data is transmitted and received in asynchronous
form unifying the data transfer rate and the transfer data format between the transmitter and the
receiver.
Figure 2.5.8 shows an external connection example in the UART mode.
3820 group Œ
XIN
8
Receive buffer register
Receive shift register
RxD
1/4
Clock control circuit
BRG
1/(n+1) 1/16
TxD
Transmit shift register
Transmit buffer register
8
3820 group 
8
TxD ^{Transmit buffer register}
Transmit shift register
Clock control circuit
BRG
1/16 1/(n+1)
XIN
1/4
RxD
Receive shift register
Receive buffer register
8
3820 group Ž
8
XIN
Transmit buffer register
TxD _{Transmit shift register}
Clock control circuit
1/4
BRG
1/16 ^1/(n+1)
RxD _{Receive shift register}
Receive buffer register
8
Fig. 2.5.8 External connection example in UART mode
2–112
3820 GROUP USER’S MANUAL