M66009FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M66009FP

8-BIT I/O EXPANDER WITH 5-BIT ADDRESS

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66009FP

8-BIT I/O EXPANDER WITH 5-BIT ADDRESS

FUNCTION

M66009 semiconductor circuit converts data from serial to

parallel and vice versa. Address can be set freely at users’

option.

It communicates with microcomputer via 4 signals lines: EN,

CLK, DI and DO.

It has 5-bit address setting input. Connect each address input

pin to VCC or GND, then the address can be determined from

among 32 patterns. When serial data arrives from microcom-

puter, this IC compares the address in the data to the address

set with these pins. If the two addresses are the same, the

given command is executed.

To output serial input data in parallel, this IC converts the

lower 8 bits of the 16-bit serial data into parallel, and outputs

each to pins D0 to D7. The upper 8 bits are processed as

address bits and command bits.

To output parallel input data in series, this IC prefixes one ac-

knowledge bit to the 8 parallel bits which respectively refer to

the status of pins D0 to D7, and then outputs 9 bits in series.

PIN DESCRIPTIONS

Pin

Name

RESET

Reset input

EN

Data enable input

CLK

Serial clock input

DI

Serial data input

DO

Serial data output

A0~A4

Address setting input

D0~D7

VCC

GND

Parallel data input/

output

Positive supply pin

Grounding pin

Input/Output

Input

Input

Input

Input

Output

Input

Input/Output

––

––

Functions

“L” level: M66009 is reset to initial state.

“L” level: M66009 becomes accessible.

Serial data that arrives at pin DI from microcomputer is taken into M66009

shift register at CLK rise edge. serial data is output from pin DO synchro-

nously with CLK fall edge.

Pin DO status stays at “H” level except during serial data output.

Connect each to Vcc or GND to set distinctive address.

Command is executed only when serial data from microcomputer includes the

same address as that set by these pins.

When connected to VCC, pin status is “1”. When connected to GND, pin status

is “0”.

Used to input/output parallel data. Because pull-down resistor is built in and

output transistor is P-ch open drain, pins in “L” output status (equals to P-ch

transistor OFF) function as input pins.

Connected positive supply (5V).

Used for grounding (0V).

INPUT/OUTPUT DATA LOGIC

Serial data input from pin DI is output in parallel from pins D0

thru D7, being inverted in logic. Parallel data input from pins

D0 thru D7 is output in series from pin DO in the same logic.

Therefore, to set I/O pins to input, DI input data should be set

to “H”.

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