MC68HC908GR8 Datasheet, PDF (229/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Chapter 22
Timer Interface Module (TIM)
22.1 Introduction
This section describes the timer interface (TIM) module. The TIM on this part is a 2-channel and
a1-channel timer that provides a timing reference with input capture, output compare, and
pulse-width-modulation functions. Figure 22-1 is a block diagram of the TIM. This particular MCU has two
timer interface modules which are denoted as TIM1 and TIM2.
For further information regarding timers on M68HC08 family devices, please consult the HC08 Timer
Reference Manual, TIM08RM/AD.
22.2 Features
Features of the TIM include:
• Three 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 pulse-width-modulation (PWM) signal generation
• Programmable TIM clock input with 7-frequency internal bus clock prescaler selection
• Free-running or modulo up-count operation
• Toggle any channel pin on overflow
• TIM counter stop and reset bits
22.3 Pin Name Conventions
The text that follows describes both timers, TIM1 and TIM2. The TIM input/output (I/O) pin names are
T[1,2]CH0 (timer 1 channel 0, timer 2 channel 0) and T[1]CH1 (timer channel 1), where “1” is used to
indicate TIM1 and “2” is used to indicate TIM2. The two TIMs share three I/O pins with three port D I/O
port pins. The full names of the TIM I/O pins are listed in Table 22-1. The generic pin names appear in
the text that follows.
Table 22-1. Pin Name Conventions
TIM Generic Pin Names:
Full TIM
Pin Names:
TIM1
TIM2
T[1,2]CH0
PTD4/ATD12/T1CH0
PTD6/ATD14/T2CH0
T[1,2]CH1
PTD5/T1CH1
—
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Freescale Semiconductor
229