MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 183

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

11.9 I/O Signals
11.9.1 TIMA Clock Pin
11.9.2 TIMA Channel I/O Pins
MC68HC908AB32
MOTOROLA
—
Rev. 1.0
Ports E and F each share two pins with the TIMA and port D shares one.
PTD6/TACLK is an external clock input to the TIMA prescaler. The four
TIMA channel I/O pins are PTE2/TACH0, PTE3/TACH1, PTF0/TACH2,
and PTF1/TACH3.
PTD6/TACLK is an external clock input that can be the clock source for
the TIMA counter instead of the prescaled internal bus clock. Select the
PTD6/TACLK input by writing logic 1s to the three prescaler select bits,
PS[2:0]. See
TACLK pulse width, TACLK
The maximum TACLK frequency is:
PTD6/TACLK is available as a general-purpose I/O pin when not used
as the TIMA clock input. When the PTD6/TACLK pin is the TIMA 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. PTF0/TACH2 and PTE3/TACH1
can be configured as buffered output compare or buffered PWM pins.
Freescale Semiconductor, Inc.
For More Information On This Product,
Timer Interface Module A (TIMA)
Go to: www.freescale.com
11.10.1 TIMA Status and Control
------------------------------------ -
bus frequency
bus frequency
LMIN
1
or TACLK
+
t
HMIN
SU
2
Timer Interface Module A (TIMA)
Register. The minimum
, is:
Technical Data
I/O Signals
183