M16C62_M Datasheet, PDF (382/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Clock-Synchronous Serial I/O
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Example of wiring
Microcomputer
TXD1 (P67)
CLKS1 (P64)
CLK1 (P65)
IN
CLK
IN
CLK
Note: _{This applies when performing only transmission with an internal}
clock selected in the clock synchronous serial I/O mode.
Example of operation
(1) Transmission enabled
(2) Start transmission
Transfer clock
(TE)
“1”
Transmit enable bit
(TI)
“0”
“1”
Transmit buffer
empty flag
“0”
(CLKMD1)
“1”
CLK, CLKS
select bit 1
“0”
(CLKMD0)
“1”
CLK, CLKS
select bit 0
“0”
(3) Transmission is complete
(4) Clock switched
CLK1
CLKS1
TxD1
UART1 Transmit ^{“1”}
interrupt request bit “0”
(IR)
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
Cleared to “0” when interrupt request is accepted, or cleared by software
Figure 2.4.10. Operation timing of transmission in clock-synchronous serial I/O mode, transfer
clock output from multiple pins function selected
2-65