HD404654 Datasheet, PDF (72/111 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404654 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
Internal clock mode
Flag reset at transfer completion
Figure 54 Example of Serial Interface 1 Operation Sequence
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