M37225M6_15 datasheet(37/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 35 of 124

REJ03B0136-0100Z

8.6.4 I2C Control Register

The I2C control register (address 00DA16) controls the data commu-

nication format.

(1) Bits 0 to 2: bit counter (BC0–BC2)

These bits decide the number of bits for the next 1-byte data to be

transmitted. An interrupt request signal occurs immediately after the

number of bits specified with these bits are transmitted.

When a START condition is received, these bits become “0002” and

the address data is always transmitted and received in 8 bits.

(2) Bit 3: I2C interface use enable bit (ESO)

This bit enables usage of the multimaster I2C BUS interface. When

this bit is set to “0,” the use disable status is provided, so the SDA

and the SCL become high-impedance. When the bit is set to “1,” use

of the interface is enabled.

When ESO = “0,” the following is performed.

• PIN = “1,” BB = “0” and AL = “0” are set (they are bits of the I2C

status register at address 00D916 ).

• Writing data to the I2C data shift register (address 00D716) is dis-

abled.

(3) Bit 4: data format selection bit (ALS)

This bit decides whether or not to recognize slave addresses. When

this bit is set to “0,” the addressing format is selected, so that ad-

dress data is recognized. When a match is found between a slave

address and address data as a result of comparison or when a gen-

eral call (refer to “8.6.5 I2C Status Register,” bit 1) is received, trans-

mission processing can be performed. When this bit is set to “1,” the

free data format is selected, so that slave addresses are not recog-

nized.

(4) Bit 5: addressing format selection bit (10BIT SAD)

This bit selects a slave address specification format. When this bit is

set to “0,” the 7-bit addressing format is selected. In this case, only

the high-order 7 bits (slave address) of the I2C address register (ad-

dress 00D816) are compared with address data. When this bit is set

to “1,” the 10-bit addressing format is selected, all the bits of the I2C

address register are compared with address data.

(5) Bits 6 and 7: connection control bits between

I2C-BUS interface and ports

(BSEL0, BSEL1)

These bits controls the connection between SCL and ports or SDA

and ports (refer to Figure 8.6.5).

Fig. 8.6.5 Connection Port Control by BSEL0 and BSEL1

“0”

“1” BSEL0

P11/SCL1

P12/SCL2

“0”

“1” BSEL1

“0”

“1” BSEL0

P13/SDA1

P14/SDA2

“0”

“1” BSEL1

Multi-master

I2C-BUS

interface

SCL

SDA

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