HD404459 Datasheet, PDF (88/122 Pages) Renesas Technology Corp – 4-bit HMCS400-series microcomputers

HD404459 Series
State
MCU reset
PMRA write
SMRA write
SMRB write
SRL, SRU
write
STS instruction
SCK pin (input)
SO pin
STS wait state
Transmit clock
wait state
Transfer state
Port selection
External clock selection
Output level control in
idle states
Data write for transmission
Undefined
LSB
Transmit clock
wait state
STS wait state
Dummy write for
state transition
Output level control in
idle states
MSB
,
_IFS
State
_{MCU reset}
PMRA write
SMRA write
SMRB write
SRL, SRU
write
STS instruction
SCK pin (output)
SO pin
STS wait state
External clock mode
Transmit clock
wait state
Transfer state
Port selection
Internal clock selection
Output level control in
idle states
Data write for transmission
Undefined
LSB
Flag reset at transfer completion
STS wait state
Output level control in
idle states
MSB
IFS
^{Internal clock mode}
Flag reset at transfer completion
Figure 69 Example of Serial Interface Operation Sequence
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