XC888LM datasheet(101/144 Pages) INFINEON

101 / 144 page

XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

3.18

Timer 2 and Timer 21

Timer 2 and Timer 21 are 16-bit general purpose timers (THL2) that are fully compatible

and have two modes of operation, a 16-bit auto-reload mode and a 16-bit one channel

capture mode, see Table 33. As a timer, the timers count with an input clock of PCLK/12

(if prescaler is disabled). As a counter, they count 1-to-0 transitions on pin T2. In the

counter mode, the maximum resolution for the count is PCLK/24 (if prescaler is

disabled).

Table 33

Timer 2 Modes

Mode

Description

Auto-reload Up/Down Count Disabled

•

Count up only

•

Start counting from 16-bit reload value, overflow at FFFF

•

Reload event configurable for trigger by overflow condition only, or by

negative/positive edge at input pin T2EX as well

•

Programmble reload value in register RC2

•

Interrupt is generated with reload event

Up/Down Count Enabled

•

Count up or down, direction determined by level at input pin T2EX

•

No interrupt is generated

•

Count up

– Start counting from 16-bit reload value, overflow at FFFF

– Reload event triggered by overflow condition

– Programmble reload value in register RC2

•

Count down

– Start counting from FFFF

H, underflow at value defined in register

RC2

– Reload event triggered by underflow condition

– Reload value fixed at FFFF

Channel

capture

•

Count up only

•

Start counting from 0000

H, overflow at FFFFH

•

Reload event triggered by overflow condition

•

Reload value fixed at 0000

•

Capture event triggered by falling/rising edge at pin T2EX

•

Captured timer value stored in register RC2

•

Interrupt is generated with reload or capture event

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