HD404054 Datasheet, PDF (68/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

HD404054 Series/HD404094 Series
State
MCU reset
PMRA write
SM1A write
SM1B write
SR1L, SR1U
write
STS instruction
SCK₁ pin (input)
SO₁ 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
,
_IFS1
State
STS wait state
External clock mode
Transmit clock
wait state
Transfer state
_{MCU reset}
PMRA write
SM1A write
SM1B write
SR1L, SR1U
write
STS instruction
SCK₁ pin (output)
SO₁ pin
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
^IFS1
Flag reset at transfer completion
Internal clock mode
Figure 51 Example of Serial Interface 1 Operation Sequence
68