M37225M6_15 datasheet(35/128 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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35 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 33 of 124

REJ03B0136-0100Z

8.6.2 I2C Address Register

The I2C address register (address 00D816) consists of a 7-bit slave

address and a read/write bit. In the addressing mode, the slave ad-

dress written in this register is compared with the address data to be

received immediately after the START condition are detected.

(1) Bit 0: read/write bit (RBW)

Not used when comparing addresses, in the 7-bit addressing mode.

In the 10-bit addressing mode, the first address data to be received

is compared with the contents (SAD6 to SAD0 + RBW) of the I2C

address register.

The RBW bit is cleared to “0” automatically when the stop condition

is detected.

(2) Bits 1 to 7: slave address (SAD0–SAD6)

These bits store slave addresses. Regardless of the 7-bit address-

ing mode and the 10-bit addressing mode, the address data trans-

mitted from the master is compared with the contents of these bits.

Fig. 8.6.3 I2C Address Register

b7 b6 b5 b4 b3 b2 b1 b0

0

Read/write bit

(RBW)

1

to

7

Slave address

(SAD0 to SAD6)

The last significant bit of address data is

compared.

0: Wait the first byte of slave address after

START condition

(read state)

1: Wait the first byte of slave address after

RESTART condition

(write state)

0

The address data is compared.

I2C Address Register

I2C address register (S0D) [Address 00D816]

B

Name

Functions

After reset R W

R—

R W

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