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Serial Interface
13-33
■ Clock synchronous serial interface timing
<Transmission>
• One-byte transfer with 8-bit data length and parity off
Fig. 13-3-3 Timing Chart (13)
• Two-byte transfer with 7-bit data length and parity on
Fig. 13-3-4 Timing Chart (14)
When transmission is enabled, transmission starts when data is written to SCnTXB.
Continuous transmission is possible by writing data to SCnTXB again while transmission is in progress.
During a 7-bit transfer, the MSB (bit 7) is ignored.
The SCnTXF flag is set to "1" when data is written to SCnTXB, and is set to "0" at the end of transmission.
The SCnTBF flag is set to "1" when data is written to SCnTXB, and is set to "0" at the start of transmission.
bp1 bp2 bp3 bp4 bp5 bp6 bp7bp0
SBO pin
SBT pin
Data write
SCnTXF flag
SCnTBF flag
Interrupt request
(when set to “transmission buffer
empty”)
Interrupt request
(when set to “transmission end”)
bp1 bp2 bp3 bp4 bp5 bp6
PTY
bp0 bp1 bp2 bp3 bp4 bp5 bp6bp0
PTY
SBO pin
SBT pin
Data write
SCnTXF flag
SCnTBF flag
Interrupt request
(when set to “transmission buffer
empty”)
Interrupt request
(when set to “transmission end”)