M16CSLASH26 datasheet(151/239 Pages) RENESAS

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UART2 Special Mode Register 2

145

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

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

1.15.14 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 1.15.15 shows the timing characteristics of detecting the start condition and the stop

condition.

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 1101 is

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

assigned to the DMA request factor

selection bits.

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

3 to 6 cycles < duration for holding (Note)

Duration for

setting up

Duration for

holding

SCL

SDA

(Start condition)

SDA

(Stop condition)

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

Table 1.15.14. Functions changed by I2C mode select bit 2

Table 1.15.15. Timing characteristics of detecting the start condition and the stop condition (Note 1)

UART2 Special Mode Register 2

UARTi special mode register 2 (address 037616) is used to further control UART2 in I2C mode.

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