s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 209
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s908ey8ad4cfjer
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M68hc08 Microcontrollers
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Freescale Semiconductor, Inc
Datasheet
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Chapter 18
Timer Interface B (TIMB) Module
18.1 Introduction
This section describes the timer interface B module (TIMB). The TIMB is a 2-channel timer that provides
a timing reference with input capture, output compare, and pulse width modulation (PWM) functions.
Figure 18-2
For further information regarding timers on M68HC08 family devices, please consult the HC08 Timer
Reference Manual, Freescale document order number TIM08RM/AD.
18.2 Features
Features include:
18.3 Functional Description
Figure 18-2
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.
Freescale Semiconductor
•
•
•
•
•
•
Two input capture/output compare channels
–
–
Buffered and unbuffered PWM signal generation
Programmable TIMB clock input
–
Free-running or modulo up-count operation
Toggle any channel pin on overflow
TIMB counter stop and reset bits
Rising-edge, falling-edge, or any-edge input capture trigger
Set, clear, or toggle output compare action
7-frequency internal bus clock prescaler selection
shows the TIMB structure. The central component of the TIMB is the 16-bit TIMB counter that
is a block diagram of the TIMB.
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
209
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