MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 314
MC68HC908AZ32ACFU
Manufacturer Part Number
MC68HC908AZ32ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AZ32ACFU.pdf
(468 pages)
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Timer Interface Module B (TIMB)
19.4 Functional Description
19.4.1 TIMB Counter Prescaler
19.4.2 Input Capture
Advance Information
314
$0048
$0049
$004A
Addr.
TIMB Ch. 1 Status/Control Register (TBSC1) CH1F
TIMB Ch. 1 Register High (TBCH1H) Bit 15
TIMB Ch. 1 Register Low (TBCH1L)
Register Name
Figure 19-1
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.
The TIMB clock source can be one of the seven prescaler outputs or the
TIMB clock pin, PTD4/ATD12. 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.
An input capture function has three basic parts: edge select logic, an
input capture latch and a 16-bit counter. Two 8-bit registers, which make
up the 16-bit input capture register, are used to latch the value of the
free-running counter after the corresponding input capture edge detector
senses a defined transition. The polarity of the active edge is
Figure 19-2. TIMB I/O Register Summary
Freescale Semiconductor, Inc.
For More Information On This Product,
Timer Interface Module B (TIMB)
shows the TIMB structure. The central component of the
Go to: www.freescale.com
Bit 7
Bit 7
R
= Reserved
CH1IE
14
6
6
13
5
0
5
MS1A
12
4
4
ELS1B
11
3
3
68HC908AZ32A — Rev 0.0
ELS1A
10
2
2
TOV1
1
9
1
MOTOROLA
CH1MAX
Bit 0
Bit 8
Bit 0
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