Specifications
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
37
Fig. 35 Timing of serial I/O2 function
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
S
y
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(
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I
N
2
Serial I/O2 register
write signal
(
N
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s
2
,
3
)
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1
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D
7
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. H
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.
N
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s
●Serial I/O2 Operating
The serial I/O2 counter is initialized to “7” by writing to the serial
I/O2 register.
After writing, whenever a synchronous clock changes from “H” to
“L”, data is output from the SOUT2 pin. Moreover, whenever a syn-
chronous clock changes from “L” to “H”, data is taken in from the
SIN2 pin, and 1 bit shift of the serial I/O2 register is carried out si-
multaneously.
When the internal clock is selected as a synchronous clock, it is
as follows if a synchronous clock is counted 8 times.
•Serial I/O2 counter = “0”
•Synchronous clock stops in “H” state
•Serial I/O2 interrupt request bit = “1”
The SOUT2 pin is in a high impedance state after transfer is com-
pleted.
When the external clock is selected as a synchronous clock, if a
synchronous clock is counted 8 times, the serial I/O2 interrupt re-
quest bit is set to “1”, and the SOUT2 pin holds the output level of
D7. However, if a synchronous clock continues being input, the
shift of the serial I/O2 register is continued and transmission data
continues being output from the SOUT2 pin.