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M30245 Group
Example of wiring
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Example of operation
Transfer clock
Transmit buffer
empty flag
Transmit register
empty flag
Transmit interrupt
request bit (IR)
Shown in ( ) are bit symbols.
The above timing applies to the following settings:
• External clock is selected.
• CLK polarity select bit = "0".
f
: frequency of external clock
EXT
Figure 2.5.14. Operation timing of transmission in serial interface special function slave mode, without clock delay
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Microcomputer
ST
(1) Set SSi port to "L" with the output from the receiver side IC port
(2) Transmission enabled
(3) Start transmission
"1"
"0"
Transfer data is set to UARTi transmit buffer register
(TE)
"1"
(TI)
"0"
"H"
SSi
"L"
CLKi
Indeter-
D
D
0
STxDi
1
minate
"1"
(TXEPT)
"0"
"1"
"0"
Cleared to "0" when interrupt request is accepted, or cleared by software
page 103 of 354
SSi
CLKi
Di
X
(4) Transmission is complete
(5) Transmit next data
Transferred from UARTi transmit butter register to transmit register
1 / f
EXT
D
D
D
D
D
D
D
2
3
0
4
5
6
7
Make sure that the following conditions are met when
the CLKi pin input ="H" before data reception
• Transmit enable bit →"1"
• Transmit data written to UARTi transmit buffer register
2. Serial Interface Special Function
Receiver side IC
Port
CLK
R
D
X
D
D
D
D
D
D
D
2
5
1
3
4
6
7
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