Data Sheet — MC68HC908MR32 • MC68HC908MR16
Section 17. Timer Interface B (TIMB)
17.1 Introduction
This section describes the timer interface module B (TIMB). The TIMB is a
2-channel timer that provides:
•
•
•
Timing reference with input capture
Output compare
Pulse-width modulation functions
Figure 17-2 is a block diagram of the TIMB.
NOTE:
The TIMB module is not available in the 56-pin shrink dual in-line package (SDIP).
17.2 Features
Features of the TIMB 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 TIMB clock input:
–
–
7-frequency internal bus clock prescaler selection
External TIMB clock input (4-MHz maximum frequency)
•
•
•
Free-running or modulo up-count operation
Toggle any channel pin on overflow
TIMB counter stop and reset bits
17.3 Functional Description
Figure 17-2 shows the TIMB structure. The central component of the TIMB is the
16-bit TIMB counter that can operate as a free-running counter or a modulo
up-counter. The TIMB counter provides the timing reference for the input capture
and output compare functions. The TIMB counter modulo registers,
TBMODH–TBMODL, control the modulo value of the TIMB counter. Software can
read the TIMB counter value at any time without affecting the counting sequence.
The two TIMB channels are programmable independently as input capture or
output compare channels.
NOTE:
The TIMB module is not available in the 56-pin SDIP.
MC68HC908MR32 • MC68HC908MR16 — Rev. 6.0
MOTOROLA
Data Sheet
255
Timer Interface B (TIMB)
FREESCALE [ Freescale ]
