s908ey16g2vfar Freescale Semiconductor, Inc, s908ey16g2vfar Datasheet - Page 219

• Manufacturer Part Number: s908ey16g2vfar
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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.
18.3.1 TIMB Counter Prescaler
The TIMB clock source can be one of the seven prescaler outputs. The prescaler generates seven clock
rates from the internal bus clock. The prescaler select bits, PS[2:0], in the TIMB status and control register
select the TIMB clock source.
Freescale Semiconductor
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Two input capture/output compare channels
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Buffered and unbuffered PWM signal generation
Programmable TIMB clock input
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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.
MC68HC908EY16A • MC68HC908EY8A Data Sheet, Rev. 1
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