MC68HC908QC16_07 Datasheet, PDF (189/274 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 16
Timer Interface Module (TIM1)
16.1 Introduction
This section describes the timer interface module (TIM1). The TIM1 module is a 4-channel timer that
provides a timing reference with input capture, output compare, and pulse-width-modulation functions.
The TIM1 module shares its pins with general-purpose input/output (I/O) port pins. See Figure 16-1 for
port location of these shared pins.
16.2 Features
Features include the following:
• Four input capture/output compare channels
– Rising-edge, falling-edge, or any-edge input capture trigger
– Set, clear, or toggle output compare action
• Buffered and unbuffered output compare pulse-width modulation (PWM) signal generation
• Programmable clock input
– 7-frequency internal bus clock prescaler selection
– External clock input pin if available, see Figure 16-1
• Free-running or modulo up-count operation
• Toggle any channel pin on overflow
• Counter stop and reset bits
16.3 Functional Description
Figure 16-2 shows the structure of the TIM1. The central component of the TIM1 is the 16-bit counter that
can operate as a free-running counter or a modulo up-counter. The counter provides the timing reference
for the input capture and output compare functions. The TIM1 counter modulo registers,
T1MODH:T1MODL, control the modulo value of the counter. Software can read the counter value,
T1CNTH:T1CNTL, at any time without affecting the counting sequence.
The four TIM1 channels are programmable independently as input capture or output compare channels.
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 3
Freescale Semiconductor
189