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M16C/5L Group, M16C/56 Group
NCH (Data output select bit) (b5)
When the clock synchronous serial I/O mode, the I
the bits SMD2 to SMD0 in the UiMR register, the output method of pins TXDi/SDAi can be selected with
the NCH bit. When bits SMD2 to SMD0 is 000b (serial interface disabled), the output method of pins
TXDi/SDAi is CMOS.
When the IICM bit in the U2SMR register is 1 (I
the output method of the SCL2 pin is N-channel open drain with the NCH bit set to 1. When the IICM bit
is 0 (other than I
pin is CMOS.
This function is used to set the P-channel transistor of the CMOS output buffer always off, but not to
change pins TXDi, SDA2 and SCL2 to open drain output completely.
Refer to the electrical characteristics for the input voltage range.
UFORM (Bit order select bit) (b7)
The UFORM bit is enabled when bits SMD2 to SMD0 in the UiMR register are 001b (clock synchronous
serial I/O mode), or 101b (UART mode, 8-bit character data).
Set the UFORM bit to 1 when bits SMD2 to SMD0 are 010b (I
SMD0 are 100b (UART mode, 7-bit character data) or 110b (UART mode, 9-bit character data).
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
2
C mode), or bits SMD2 to SMD0 is other than 010b, the output method of the SCL2
21. Serial Interface UARTi (i = 0 to 4)
2
C mode, or the UART mode is selected by setting
2
C mode) and bits SMD2 to SMD0 is 010b (I
2
C mode), and to 0 when bits SMD2 to
2
C mode),
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