M38045F2HKP datasheet(79/387 Pages) RENESAS

79 / 387 page

1-61

REJ09B0212-0100Z

Rev.1.00

Jan 14, 2005

3804 Group (Spec.H)

HARDWARE

FUNCTIONAL DESCRIPTION

[I2C Data Shift Register (S0)] 001116

The I2C data shift register (S0: address 001116) is an 8-bit shift

When transmit data is written into this register, it is transferred to

the outside from bit 7 in synchronization with the SCL, and each

time one-bit data is output, the data of this register are shifted by

one bit to the left. When data is received, it is input to this register

from bit 0 in synchronization with the SCL, and each time one-bit

data is input, the data of this register are shifted by one bit to the

left. The minimum 2 cycles of the internal clock

φ are required

from the rising of the SCL until input to this register.

The I2C data shift register is in a write enable status only when the

I2C-BUS interface enable bit (ES0 bit) of the I2C control register

(S1D: address 001416) is “1”. The bit counter is reset by a write in-

struction to the I2C data shift register. When both the ES0 bit and

the MST bit of the I2C status register (S1: address 001316) are “1,”

the SCL is output by a write instruction to the I2C data shift regis-

ter. Reading data from the I2C data shift register is always enabled

regardless of the ES0 bit value.

[I2C SlaveAddress Registers 0 to 2 (S0D0 to S0D2)]

0FF716 to 0FF916

The I2C slave address registers 0 to 2 (S0D0 to S0D2: addresses

0FF716 to 0FF916) consists of a 7-bit slave address and a read/

write bit. In the addressing mode, the slave address written in this

ately after the START condition is detected.

•Bit 0: Read/write bit (RWB)

This is not used in the 7-bit addressing mode. In the 10-bit ad-

dressing mode, set RWB to “0” because the first address data to

be received is compared with the contents (SAD6 to SAD0 +

RWB) of the I2C slave address registers 0 to 2.

When 2-byte address data match slave address, a 7-bit slave ad-

dress which is received after restart condition has detected and

R/W data can be matched by setting “1” to RWB with software.

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

detected.

•Bits 1 to 7: Slave address (SAD0–SAD6)

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

ing mode or the 10-bit addressing mode, the address data

transmitted from the master is compared with these bits’ contents.

Fig. 57 Structure of I2C slave address registers 0 to 2

SAD6 SAD5 SAD4SAD3SAD2 SAD1 SAD0RWB

Slave address

I2C slave address register 0

(S0D0: address 0FF716)

I2C slave address register 1

(S0D1: address 0FF816)

I2C slave address register 2

(S0D2: address 0FF916)

Read/write bit

b7b0

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