XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 330
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC908AS60ACFU.pdf
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Timer Interface Module B (TIMB)
20.8 I/O Signals
20.8.1 TIMB Clock Pin (PTD4/ATD12/TBCLK)
20.8.2 TIMB Channel I/O Pins (PTF5/TBCH1–PTF4/TBCH0)
Technical Data
330
I/O registers during the break state without affecting status bits. Some
status bits have a 2-step read/write clearing procedure. If software does
the first step on such a bit before the break, the bit cannot change during
the break state as long as BCFE is at logic 0. After the break, doing the
second step clears the status bit.
Port D shares one of its pins with the TIMB. Port F shares two of its pins
with the TIMB. PTD4/ATD12/TBCLK is an external clock input to the
TIMB prescaler. The two TIMB channel I/O pins are PTF4/TBCH0 and
PTF5/TBCH1.
PTD4/ATD12/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/ATD12/TBCLK input by writing logic 1s to the three
prescaler select bits, PS[2:0] (see
The minimum TCLK pulse width, TCLK
The maximum TCLK frequency is the least: 4 MHz or bus frequency ÷ 2.
PTD4/ATD12/TBCLK is available as a general-purpose I/O pin or ADC
channel when not used as the TIMB clock input. When the
PTD4/ATD12/TBCLK pin is the TIMB clock input, it is an input regardless
of the state of the DDRD4 bit in data direction register D.
Each channel I/O pin is programmable independently as an input
capture pin or an output compare pin. PTF4/TBCH0 and PTF5/TBCH1
can be configured as buffered output compare or buffered PWM pins.
Timer Interface Module B (TIMB)
------------------------------------ -
bus frequency
1
TIMB Status and Control
LMIN
+
t
SU
or TCLK
MC68HC908AZ60A — Rev 2.0
HMIN
, is:
Register).
MOTOROLA
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