M30222 Datasheet, PDF (133/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
Specifications in this manual are tentative and subject to change
M30222 Group
Rev. G
UART2 in I²C Mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
1. Bus collision detect sampling clock select bit (Bit 4 of the UART2 special mode register)
0: Rising edges of the transfer clock
CLK
TxD/RxD
Timer A0
1: Timer A0 overflow
2. Auto clear function select bit of transmt enable bit (Bit 5 of the UART2 special mode register)
CLK
TxD/RxD
Bus collision
detect interrupt
request bit
Transmit
enable bit
3. Transmit start condition select bit (Bit 6 of the UART2 special mo de register)
0: In normal state
CLK
TxD
Enabling transmission
With "1: falling edge of RxD2" selected
CLK
TxD
RxD
Fig. 1.106. Some other functions added
Bit 5 of the UART2 special mode register is used as the auto clear function select bit of transmit enable
bit. Setting this bit to “1” automatically resets the transmit enable bit to “0” when “1” is set in the bus
collision detect interrupt request bit (nonconformity).
Bit 6 of the UART2 special mode register is used as the transmit start condition select bit. Setting this bit
to “1” starts the TxD transmission in synchronization with the falling edge of the RxD terminal.
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