MC68HC908GR16 Datasheet, PDF (247/310 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Timer Interface Module (TIM)
Features
18.2 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 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
18.3 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 port D I/O port pins. The full names of the TIM I/O pins
are listed in Table 18-1. The generic pin names appear in the text that follows.
Table 18-1. Pin Name Conventions
TIM Generic Pin Names:
Full TIM Pin Names:
TIM1
TIM2
T[1,2]CH0
PTD4/T1CH0
PTD6/T2CH0
T[1,2]CH1
PTD5/T1CH1
PTD7/T2CH1
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.
18.4 Functional Description
Figure 18-1 shows the structure of the TIM. The central component of the TIM is
the 16-bit TIM counter that can operate as a free-running counter or a modulo
up-counter. The TIM counter provides the timing reference for the input capture
and output compare functions. The TIM counter modulo registers,
TMODH:TMODL, control the modulo value of the TIM counter. Software can read
the TIM counter value at any time without affecting the counting sequence.
The two TIM channels (per timer) are programmable independently as input
capture or output compare channels. If a channel is configured as input capture,
MC68HC908GR16 — Rev. 1.0
MOTOROLA
Timer Interface Module (TIM)
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Data Sheet
247