M62320FP 查看數據表（PDF） - Renesas Electronics

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M62320FP

8-bit I/O Expander for I²C BUS

Renesas Electronics 

M62320P/FP

Functional Blocks

I2C BUS Interface

The I2C BUS interface recognizes start/stop conditions, a slave address and a write/read mode selection by receiving

SDA, SCL, CS0, CS1 and CS2 signals and then the latch pulses, dedicated to each data latch are generated.

Data Latch

This IC has 3 types of data latch: the I/O setting data latch, the input data latch and the output data latch and each latch

is controlled by the I2C BUS interface.

• I/O setting data latch

These latches set input- or output-state of each parallel data terminals (D0 to D7). They are set at the next byte after

receiving the slave address byte in the write mode from the master. In case this latch is set to high, the data is

transferred from the I2C BUS interface to the parallel data terminals. In the opposite transmission: from the parallel

data terminals to the I2C BUS, it is set to low.

• Output data latch

In the write mode, the data from the I2C BUS to the parallel data terminals is latched. When the master transmits

output data after a setting in write mode, the output data is taken into the latches.

• Input data latch

In the read mode, the data of parallel data terminals is latched in the input data latches. The input data is taken into

the latches from the parallel data terminals on every 8th negative edge of SCL clock. The latched data is output to

the master through the sift resistor. On the output terminal assigned by the I/O setting latch, the input data latch

takes the state of the output terminal.

Parallel Input/Output Port

In case I/O setting latch is set to low (the input mode), each parallel terminal becomes hi-impedance and is able to

accept an input. In another case I/O setting latch is set to high (output mode), each parallel terminal output a data

according to the state of the output data latch.

Power on Reset

When power is turned on, each latch is reset and then the parallel data I/O terminals become hi-impedance (input mode).

REJ03D0863-0300 Rev.3.00 Mar 25, 2008

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