Renesas M16C Series User Manual page 209

M30240 Group
Example of Wiring
Microcomputer
Note: This applies when performing transmission with an internal
Example of Operation
Transfer clock
"1"
Transmit enable bit
"0"
"1"
Transmit buffer
empty flag
"0"
"1"
CLK, CLKS
"0"
select bit 1
"1"
CLK, CLKS
select bit 0 "0"
CLK
1
CLKS
1
TxD
1
"1"
Transmit interrupt
request bit "0"
Figure 2.48: Operation timing of transmission in clock synchronous serial I/O mode, transfer clock
output from multiple pins function selected
Rev.1.00 Sep 24, 2003 Page 191 of 360
T D (P6 )
X 1 7
CLKS
(P6 )
1 4
CLK (P6 )
1 5
clock selected and in the clock synchronous serial I/O mode only.
(1) Transmission enabled (3) Transmission is complete
(2) Start transmission
D D D D D D D D
0 3
1 2 4 5 6
Cleared to "0" when interrupt request is accepted, or cleared by software
IN IN
CLK CLK
(4) Clock switched
D D D D
7 0
1 2
Clock-Synchronous Serial I/O
D D D D
3 7
4 5 6