Programming The Epa And Timer/Counters; Configuring The Epa And Timer/Counter Port Pins; Programming The Timers - Intel 8XC196K Series User Manual

Table of Contents

With this method, the resolution of the EPA (Figure 10-8 on page 10-18 and Figure 10-9 on page

10-19) determines the maximum PWM output frequency. (Resolution is the minimum time re-

quired between a capture or compare.) At 16 MHz, a 250 ns resolution results in a maximum

PWM of 4 MHz.

10.5 PROGRAMMING THE EPA AND TIMER/COUNTERS

This section discusses configuring the port pins for the EPA and the timer/counters; describes

how to program the timers, the capture/compare channels, and the compare-only channels; and

explains how to enable the EPA interrupts.

Before you can use the EPA, you must configure the pins of port 1 and port 6 to serve as the spe-

cial-function signals for the EPA and, optionally, for the timer/counter clock source and direction

control signals. See "Bidirectional Ports 1, 2, 5, and 6" on page 6-4 for information about config-

uring the port pins.

If you use T2CLK as the timer 2 input clock, you cannot use EPA

capture/compare channel 0. If you use T2DIR as the timer 2 direction-control

source, you cannot use EPA capture/compare channel 1.

Table 10-2 on page 10-3 lists the pins associated with the EPA and the timer/counters. Pins that

are not being used for an EPA channel or timer/counter can be configured as standard I/O.

The control registers for the timers are T1CONTROL (Figure 10-8) and T2CONTROL (Figure

10-9). Write to these registers to configure the timers. Write to the TIMER1 and TIMER2 regis-

ters to load a specific timer value.

EVENT PROCESSOR ARRAY (EPA)