HD404669 Datasheet, PDF (83/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 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
Idle
LSB
,
_IFS1
State
_{MCU reset}
PMRA write
SM1A write
SM1B write
SR1L, SR1U write
STS instruction
SCK₁ pin (output)
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
Idle
LSB
^IFS1
Transmit clock
wait state
STS wait state
Dummy write for
state transition
Output level control in
idle states
MSB
Idle
Flag reset at transfer completion
STS wait state
Output level control in
idle states
MSB
Idle
Flag reset at transfer completion
Internal clock mode
Figure 60 Example of Serial Interface Operation Sequence
83