HD404369 Datasheet, PDF (80/117 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404369 Series
State
MCU reset
PMRA write
SMR write
PMRC 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
,
_IFS
State
_{MCU reset}
PMRA write
SMR write
PMRC 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
IFS
^{Internal clock mode}
Transmit clock
wait state
STS wait state
Dummy write for
state transition
Output level control in
idle states
MSB
Flag reset at transfer completion
STS wait state
Output level control in
idle states
MSB
Flag reset at transfer completion
Figure 60 Example of Serial Interface Operation Sequence
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