HD404449 Datasheet, PDF (85/123 Pages) Hitachi Semiconductor – HD404449 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
HD404449 Series
Transmit clock
wait state
STS wait state
Dummy write for
state transition
Output level control in
idle states
MSB
,
_IFS1
State
_{MCU reset}
PMRA write
SM1A write
SM1B write
SR1L, SR1U
write
STS instruction
SCK₁ pin (input)
SO₁ 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
^IFS1
Internal clock mode
Flag reset at transfer completion
Figure 68 Example of Serial Interface 1 Operation Sequence
85