M30222 Datasheet, PDF(136/237 Page) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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M30222 Datasheet, PDF (136/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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dUevnedloerpment

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

Starting to transmit/receive signals to/from UART2 using this function doesnât change the value of the

transmission buffer empty flag. To use this function, choose the external clock for the transfer clock.

Bit 5 of the UART2 special mode register 2 (037616) is used as the SCL pin wait output bit 2. Setting

this bit to â1â with the serial I/O specified allows the user to output an â1â from the SCL pin even if

UART2 is in operation. Setting this bit to â0â frees the âLâ output from the SCL pin, and the UART2

clock is input/output.

Bit 6 of the UART2 special mode register 2 (037616) is used as the SDA output disable bit. Setting this

bit to â1â forces the SDA pin to turn to the high-impedance state. Refrain from changing the value of

this bit at the rising edge of the UART2 transfer clock. There can be instances in which arbitration lost

detection flag is turned on.

1-137

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