M32C8A Datasheet, PDF(245/372 Page) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

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M32C8A Datasheet, PDF (245/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

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M32C/8A Group

17. Serial Interfaces

As shown in Table 17.9, I2C mode is entered when bits SMD2 to SMD0 in the UiMR register are set to 010b

(I2C mode) and the IICM bit in the UiSMR register to 1 (I2C mode). Because an SDAi transmit output passes

through a delay circuit, output signal from the SDAi pin changes after the SCLi pin level becomes low (âLâ)

and the âLâ output stabilizes.

Table 17.9 Functions in I2C Mode (1)

Function

I2C Mode (SMD2 to SMD0 = 010b, IICM = 1)

IICM2 = 0

(NACK/ACK interrupt)

IICM2 = 1

(UART transmit/receive interrupt)

CKPH = 0

(no clock delay)

CKPH = 1

(clock delay)

CKPH = 0

(no clock delay)

CKPH = 1

(clock delay)

Interrupt source for

numbers 39 to 41(1)

(See Figure 17.24)

Start condition or stop condition detection

(See Table 17.12 STSPSEL Bit Function)

Interrupt source for

numbers 17, 19, 33, 35,

37(1)

(See Figure 17.24)

No acknowledgement detection (NACKi) -

at the rising edge of 9th bit of SCLi

UARTi transmit

operation - at the

rising edge of 9th bit

of SCLi

UARTi transmit

operation - at the

next falling edge after

the 9th bit of SCLi

Interrupt source for

numbers 18, 20, 34, 36,

38(1)

(See Figure 17.24)

Acknowledgement detection (ACKi) -

at the rising edge of 9th bit of SCLi

UARTi receive operation - at the falling edge

of 9th bit of SCLi

Data transfer timing

from the UART receive

shift register to the UiRB

register

At rising edge of 9th bit of SCLi

Falling edge of 9th bit Falling edge and

of SCLi

rising edge of 9th bit

of SCLi

UARTi transmit output Delay

delay

Functions of P6_3,

P6_7, P7_0, P9_2,

P9_6

Functions of P6_2,

P6_6, P7_1, P9_1,

P9_7

SDAi input and output

SCLi input and output

Noise filter width

200 ns

i = 0 to 4

NOTE:

1. Use the following procedures to change an interrupt source.

(a) Disable an interrupt of the corresponding interrupt number.

(b) Change an interrupt source.

(c) Set the IR bit of a corresponding interrupt number to 0 (interrupt not requested).

(d) Set bits ILVL2 to ILVL0 of the corresponding interrupt number.

Rev.1.00 Jul 15, 2007 Page 228 of 352

REJ09B0385-0100

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