s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 183

• Manufacturer Part Number: s908ab32ag0cfue
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

11.9 I/O Signals
11.9.1 TIMA Clock Pin
11.9.2 TIMA Channel I/O Pins
MC68HC908AB32
Freescale Semiconductor
—
Rev. 1.1
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.
Timer Interface Module A (TIMA)
11.10.1 TIMA Status and Control
------------------------------------ -
bus frequency
bus frequency ÷ 2
LMIN
1
or TACLK
+
t
HMIN
SU
Timer Interface Module A (TIMA)
Register. The minimum
, is:
Technical Data
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