MC68HC08AB16A Datasheet, PDF (194/380 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Timer Interface Module B (TIMB)
12.5.3.2 Buffered Output Compare
Channels 0 and 1 can be linked to form a buffered output compare
channel whose output appears on the PTF4/TBCH0 pin. The TIMB
channel registers of the linked pair alternately control the output.
Setting the MS0B bit in TIMB channel 0 status and control register
(TBSC0) links channel 0 and channel 1. The output compare value in
the TIMB channel 0 registers initially controls the output on the
PTF4/TBCH0 pin. Writing to the TIMB channel 1 registers enables the
TIMB channel 1 registers to synchronously control the output after the
TIMB overflows. At each subsequent overflow, the TIMB channel
registers (0 or 1) that control the output are the ones written to last.
TBSC0 controls and monitors the buffered output compare function,
and TIMB channel 1 status and control register (TBSC1) is unused.
While the MS0B bit is set, the channel 1 pin, PTF5/TBCH1, is available
as a general-purpose I/O pin.
Channels 2 and 3 can be linked to form a buffered output compare
channel whose output appears on the PTF2/TBCH2 pin. The TIMB
channel registers of the linked pair alternately control the output.
Setting the MS2B bit in TIMB channel 2 status and control register
(TBSC2) links channel 2 and channel 3. The output compare value in
the TIMB channel 2 registers initially controls the output on the
PTF2/TBCH2 pin. Writing to the TIMB channel 3 registers enables the
TIMB channel 3 registers to synchronously control the output after the
TIMB overflows. At each subsequent overflow, the TIMB channel
registers (2 or 3) that control the output are the ones written to last.
TBSC2 controls and monitors the buffered output compare function,
and TIMB channel 3 status and control register (TBSC3) is unused.
While the MS2B bit is set, the channel 3 pin, PTF3/TBCH3, is available
as a general-purpose I/O pin.
NOTE:
In buffered output compare operation, do not write new output compare
values to the currently active channel registers. Writing to the active
channel registers is the same as generating unbuffered output
compares.
Technical Data
194
MC68HC08AB16A — Rev. 2.0
Timer Interface Module B (TIMB)
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