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M30218 Datasheet, PDF (96/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group | |||
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Clock synchronous serial I/O mode
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(a) Polarity select function
As shown in Figure GA-8, the CLK polarity select bit (bit 6 at addresses 03A416, 03AC16) allows
selection of the polarity of the transfer clock.
⢠When CLK polarity select bit = â0â
CLKi
TXDi
D0 D1 D2 D3 D4 D5 D6 D7
RXDi
D0 D1 D2 D3 D4 D5 D6 D7
Note 1: The CLKi pin level when not
transferring data is âHâ.
⢠When CLK polarity select bit = â1â
CLKi
TXDi
D0 D1 D2 D3 D4 D5 D6 D7
RXDi
D0 D1 D2 D3 D4 D5 D6 D7
Figure GA-8. Polarity of transfer clock
Note 2: The CLKi pin level when not
transferring data is âLâ.
(b) LSB first/MSB first select function
As shown in Figure GA-9, when the transfer format select bit (bit 7 at addresses 03A416, 03AC16) =
â0â, the transfer format is âLSB firstâ; when the bit = â1â, the transfer format is âMSB firstâ.
⢠When transfer format select bit = â0â
CLKi
TXDi
D0 D1 D2 D3 D4 D5 D6 D7
RXDi
D0 D1 D2 D3 D4 D5 D6 D7
LSB first
⢠When transfer format select bit = â1â
CLKi
TXDi
RXDi
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
MSB first
Note: This applies when the CLK polarity select bit = â0â.
Figure GA-9. Transfer format
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