User Manual

APEX/APEX LT

Datasheet (Preliminary Rev 0.2) www.lsr.com Page 6 of 20

The APEX module contains 16 GPIO ports that are shared with other peripheral or alternate

functions. The alternate functions can be utilized on a variety of different GPIOs as detailed

in the following table of pin assignments and definitions. All the GPIO pads are selectable as

input, output, or bi-directional and have an internal pull-up or pull-down.

The integrated Serial Controller SC1 can be configured for SPI (master-only), I

C (master-

only), or UART functionality. The Serial Controller SC2 can be configured for SPI (master or

slave) or I

C (master-only) operation. The integrated ADC can sample analog signals from

three GPIO pins single-ended or differentially. The integrated voltage reference VREF for

the ADC can be made available to a GPIO port.

Please consult the Ember EM250 datasheet for details on configuring and controlling the

information flow of the APEX module interface ports to setup the following:

• GPIO Data Registers

• Alternate function routing

• External Interrupts

• Serial Controller SC1 module (UART mode, SPI Master mode, I

C Master mode)

• Serial Controller SC2 module (SPI modes, I

C Master mode)

• General Purpose Timers

• ADC Module

• Event Manager