User Manual

CHAPTER 5

Matrix/Zigbee Ready Module Input/Output

5.1 Overview

There are a total of 12 user input/output pins on the Matrix module, all of

which can be configured as digital inputs or outputs. Of the 12 configurable

digital I/O pins, 8 of them can also be configured as analog inputs.

5.2 Digital Inputs/Outputs

There are 12 configurable digital input/output pins that can be programmed

to be either inputs or outputs. In addition, if the pins are inputs, all except for

two (P1_0 and P1_1) of them can be enabled for either an internal pull-up or

pull-down resistor. Refer to Table 4-2 for the specific I/O pin capabilities.

Using the digital input output pins consists of the following:

Configuring the pins

Select direction (digital input or digital output), enable or disable pull-

up or pull-down resistors for pins configured as digital inputs, and set

the initial output value for pins configured as digital outputs (0 or 1).

These parameters define the configuration of the pins when a reset

occurs. Also the direction and pull-up/pull-down parameters are

used to set the state of the pins after exiting sleep mode. Note that if

the internal pull-up or pull-down resistors are used that all pins within

the same port have to either be pull-ups or pull-downs.

Configuring the sleep state of the pins

Select direction (input or output), enable or disable pull-up or pull-

down resistors for pins configured as digital inputs, and set the

output value for pins configured as digital outputs. Although these

parameters are the same as those shown in the “Configuring the

pins” item shown above, they are independent and are the state of

the pins when the Matrix module is put into Sleep Mode.

Reading the state of the pins configured as inputs

Read the digital value (0 or 1) of the signal applied to the pins

configured as inputs.

Setting the state of the pins configured as outputs

Set the digital value (0 or 1) for the pins configured as outputs.