M16CSLASH62M datasheet(161/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

UART2 Special Mode Register 2

1-142

Bit 0 of the UART2 special mode register 2 (address 037616) is used as the I2C mode select bit 2. Table

1.16.11 shows the types of control to be changed by I2C mode select bit 2 when the I2C mode select bit

is set to “1”. Table 1.16.12 shows the timing characteristics of detecting the start condition and the stop

condition. Set the start/stop condition control bit (bit 7 of UART2 special mode register 2) to “1” in I2C

mode.

Function

IICM2 = 1

IICM2 = 0

Factor of interrupt number 15

No acknowledgment detection (NACK)

UART2 transmission (the rising edge

of the final bit of the clock)

Factor of interrupt number 16

Acknowledgment detection (ACK)

UART2 reception (the falling edge

of the final bit of the clock)

DMA1 factor at the time when 1 1 0 1

is assigned to the DMA request

factor selection bits

Acknowledgment detection (ACK)

UART2 reception (the falling edge of

the final bit of the clock)

Timing for transferring data from the

UART2 reception shift register to the

reception buffer.

The rising edge of the final bit of the

reception clock

The falling edge of the final bit of the

reception clock

Timing for generating a UART2

reception/ACK interrupt request

The rising edge of the final bit of the

reception clock

The falling edge of the final bit of the

reception clock

3 to 6 cycles < duration for setting-up (Note 2)

3 to 6 cycles < duration for holding (Note 2)

Note 1 : When the start/stop condition control bit SHTC is “1” .

Note 2 : “Cycles” is in terms of the input oscillation frequency f(XIN) of the main clock.

Duration for

setting up

Duration for

holding

SCL

SDA

(Start condition)

SDA

(Stop condition)

Table 1.16.11. Functions changed by I2C mode select bit 2

Table 1.16.12. Timing characteristics of detecting the start condition and the stop condition (Note 1)

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