Clock-Synchronous Serial I/O
M30240 Group
Rev.1.00 Sep 24, 2003 Page 191 of 360
Figure 2.48: Operation timing of transmission in clock synchronous serial I/O mode, transfer clock
output from multiple pins function selected
Microcomputer
TXD1 (P67)
CLKS
1 (P64)
CLK
1 (P65)
IN
CLK
IN
CLK
Note: This applies when performing transmission with an internal
clock selected and in the clock synchronous serial I/O mode only.
Example of Wiring
Example of Operation
Transmit interrupt
request bit
“0”
“1”
Cleared to “0” when interrupt request is accepted, or cleared by software
Transmit buffer
empty flag
CLK
1
TxD1
“0”
“1”
Transmit enable bit
“0”
“1”
Transfer clock
CLKS1
D0
D1 D2
D3
D4 D5 D6
D7 D0
D1 D2
D3
D4 D5 D6
D7
CLK, CLKS
select bit 1
“0”
“1”
“0”
“1”
CLK, CLKS
select bit 0
(1) Transmission enabled
(2) Start transmission
(3) Transmission is complete
(4) Clock switched
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