MC68HC908AP16CFB datasheet(182/440 Pages) MOTOROLA

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Timer Interface Module (TIM)

Data Sheet

MC68HC908AP Family — Rev. 2.5

182

MOTOROLA

11.3 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 full names of the TIM I/O pins are listed in

Table 11-1. The generic pin names appear in the text that follows.

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.

11.4 Functional Description

Figure 11-1 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.

Table 11-1. Pin Name Conventions

TIM Generic Pin Names:

T[1,2]CH0

T[1,2]CH1

Full TIM

Pin Names:

TIM1

PTB4/T1CH0

PTB5/T1CH1

TIM2

PTB6/T2CH0

PTB7/T2CH1

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 182 Page - Motorola, Inc