MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 209

• Manufacturer Part Number: MC68HC908AB32
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

12.9 I/O Signals
12.9.1 TIMB Clock Pin
12.9.2 TIMB Channel I/O Pins
MC68HC908AB32
MOTOROLA
—
Rev. 1.0
Port F shares four pins with the TIMB and port D shares one.
PTD4/TBCLK is an external clock input to the TIMB prescaler. The four
TIMB channel I/O pins are PTF4/TBCH0, PTF5/TBCH1, PTF2/TBCH2,
and PTF3/TBCH3.
PTD4/TBCLK is an external clock input that can be the clock source for
the TIMB counter instead of the prescaled internal bus clock. Select the
PTD4/TBCLK input by writing logic 1s to the three prescaler select bits,
PS[2:0]. See
TBCLK pulse width, TBCLK
The maximum TBCLK frequency is:
PTD4/TBCLK is available as a general-purpose I/O pin when not used
as the TIMB clock input. When the PTD4/TBCLK pin is the TIMB clock
input, it is an input regardless of the state of the DDRD6 bit in data
direction register D.
Each channel I/O pin is programmable independently as an input
capture pin or an output compare pin. PTF2/TBCH2 and PTF5/TBCH1
can be configured as buffered output compare or buffered PWM pins.
Freescale Semiconductor, Inc.
For More Information On This Product,
Timer Interface Module B (TIMB)
Go to: www.freescale.com
12.10.1 TIMB Status and Control
------------------------------------ -
bus frequency
bus frequency
LMIN
1
or TBCLK
+
t
HMIN
SU
2
Timer Interface Module B (TIMB)
Register. The minimum
, is:
Technical Data
I/O Signals
209