XC888LM datasheet(100/144 Pages) INFINEON

100 / 144 page

XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

3.17

Timer 0 and Timer 1

Timer 0 and Timer 1 can function as both timers or counters. When functioning as a

timer, Timer 0 and Timer 1 are incremented every machine cycle, i.e. every 2 input

clocks (or 2 PCLKs). When functioning as a counter, Timer 0 and Timer 1 are

incremented in response to a 1-to-0 transition (falling edge) at their respective external

input pins, T0 or T1.

Timer 0 and 1 are fully compatible and can be configured in four different operating

modes for use in a variety of applications, see Table 32. In modes 0, 1 and 2, the two

timers operate independently, but in mode 3, their functions are specialized.

Table 32

Timer 0 and Timer 1 Modes

Mode

Operation

13-bit timer

The timer is essentially an 8-bit counter with a divide-by-32 prescaler.

This mode is included solely for compatibility with Intel 8048 devices.

16-bit timer

The timer registers, TLx and THx, are concatenated to form a 16-bit

counter.

8-bit timer with auto-reload

The timer register TLx is reloaded with a user-defined 8-bit value in THx

upon overflow.

Timer 0 operates as two 8-bit timers

The timer registers, TL0 and TH0, operate as two separate 8-bit counters.

Timer 1 is halted and retains its count even if enabled.

XC888LM Datasheet(PDF) 100 Page - Infineon Technologies AG