MC68HC812A4 Datasheet, PDF (195/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Standard Timer Module
Registers and Reset Initialization
PUPT — Port T Pullup Enable Bit
PUPT enables pullup resistors on the timer port pins when the pins
are configured as inputs.
1 = Pullup resistors enabled
0 = Pullup resistors disabled
RDPT — Port T Reduced Drive Bit
RDPT reduces the output driver size for lower current and less noise.
1 = Output drive reduction enabled
0 = Output drive reduction disabled
TCRE — Timer Counter Reset Enable Bit
TCRE allows the counter to be reset by a channel 7 output compare.
1 = Counter reset enabled
0 = Counter reset disabled
NOTE: When the timer channel 7 registers contain $0000 and TCRE is set, the
timer counter registers remain at $0000 all the time.
When the timer channel 7 registers contain $FFFF and TCRE is set,
TOF never gets set even though the timer counter registers go from
$FFFF to $0000.
PR2, PR1, and PR0 — Timer Prescaler Select Bits
These bits select the prescaler divisor for the timer counter.
Table 12-3. Prescaler Selection
PR[2:1:0]
000
001
010
011
100
101
110
111
Prescaler Divisor
1
2
4
8
16
32
Reserved
Reserved
NOTE: The newly selected prescale divisor does not take effect until the next
synchronized edge when all prescale counter stages equal 0.
Advance Information
MOTOROLA
Standard Timer Module
MC68HC812A4 — Rev. 3.0
195