MC68HC08JL8 Datasheet, PDF (105/212 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 8
Timer Interface Module (TIM)
8.1 Introduction
This section describes the timer interface (TIM) module. The TIM is a two-channel timer that provides a
timing reference with Input capture, output compare, and pulse-width-modulation functions. Figure 8-1 is
a block diagram of the TIM.
This particular MCU has two timer interface modules which are denoted as TIM1 and TIM2.
8.2 Features
Features of the TIM include:
• Two 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
– 7-frequency internal bus clock prescaler selection
– External clock input on timer 2 (bus frequency ÷2 maximum)
• Free-running or modulo up-count operation
• Toggle any channel pin on overflow
• TIM counter stop and reset bits
8.3 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 channel 0) and T[1,2]CH1 (timer channel 1), where “1” is used to indicate TIM1 and “2”
is used to indicate TIM2. The two TIMs share four I/O pins with four I/O port pins. The external clock input
for TIM2 is shared with the an ADC channel pin. The full names of the TIM I/O pins are listed in Table 8-1.
The generic pin names appear in the text that follows.
Table 8-1. Pin Name Conventions
TIM Generic Pin Names:
Full TIM
Pin Names:
TIM1
TIM2
T[1,2]CH0
PTD4/T1CH0
PTE0/T2CH0
T[1,2]CH1
PTD5/T1CH1
PTE1/T2CH1
T2CLK
—
ADC12/T2CLK
NOTE
References to either timer 1 or timer 2 may be made in the following text by
omitting the timer number. For example, TCH0 may refer generically to
T1CH0 and T2CH0, and TCH1 may refer to T1CH1 and T2CH1.
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
Freescale Semiconductor
105