MA009A Datasheet, PDF (4/19 Pages) Megawin Technology Co., Ltd – 24-bit I/O extender with interrupt function

Function Description
There are three 8-bit I/O ports (P0 is pure input port, P1 is I/O port and P2 is pure output port) and one
interrupt output pin (INTB) in MA009. The MA009 operates as a slave that sends and receives data
through a 3-wire interface. The interface uses a command/data select line (C/DB); serial
command/data line (Sin) and a serial clock line (SCLK) to achieve bidirectional communication
between master(s) and slave(s). The master (such as microcontroller) should send serial clock and
serial command to configure or to get data from MA009. The serial communication waveform are
shown as below:
COMMAND WRITE PERIOD
COMMAND
DATA
C/DB
SCLK
Sin
MSB
LSB
Command Write Period Waveform (command should be ready in rising edge)
COMMAND READ PERIOD
COMMAND
DATA
C/DB
SCLK
Sin
MSB
LSB
Command Read Period Waveform (master can get data in falling edge)
4
MA009A Technical Summary
MEGAWIN