M32CSLASH86 datasheet(229/505 Pages) RENESAS

229 / 505 page

Page 206

17. Serial I/O (Special Function)

)

(

17.3 Special Mode 1 (I2C Mode)

I2C mode is a mode to communicate with external devices with a simplified I2C. Table 17.12 lists specifica-

tions of I2C mode. Table 17.13 lists register settings, Table 17.14 lists each function. Figure 17.19 shows

a block diagram of I2C mode. Figure 17.20 shows timings for transfer to the UiRB register (i=0 to 4) and

interrupts. Tables 17.15 to 17.17 list pin settings.

As shown in Table 17.12, I2C mode is entered when the SMD2 to SMD0 bits in the UiMR register is set to

"0102" and the IICM bit in the UiSMR register is set to "1". Output signal from the SDAi pin changes after

the SCLi pin level becomes low ("L") and stabilizes due to a SDAi transmit output via the delay circuit.

Table 17.12 I2C Mode Specifications

Item

Specifications

Interrupt

Start condition detect, stop condition detect, no acknowledgment detect, acknowledgment

detect

Selectable Function

• Arbitration lost

The update timing of the ABT bit in the UiRB register can be selected.

Refer to 17.3.3 Arbitration

• SDAi digital delay

Selected from no digital delay or 2 to 8 cycle delay of the count source of the UiBRG register.

Refer to 17.3.5 SDA Output

• Clock phase setting

Selected from clock delay or no clock delay.

Refer to 17.3.4 Transfer clock

M32C/86 Datasheet(PDF) 229 Page - Renesas Technology Corp