MC908AZ60ACFU Freescale Semiconductor, MC908AZ60ACFU Datasheet - Page 312

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MC908AZ60ACFU

Manufacturer Part Number
MC908AZ60ACFU
Description
IC MCU FLASH 8.4MHZ 60K 64QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908AZ60ACFU

Core Processor
HC08
Core Size
8-Bit
Speed
8.4MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
52
Program Memory Size
60KB (60K x 8)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 15x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Timer Interface Module A (TIMA)
PTF2 pin. Writing to the TIMA channel 5 registers enables the TIMA channel 5 registers to synchronously
control the output after the TIMA overflows. At each subsequent overflow, the TIMA channel registers (4
or 5) that control the output are the ones written to last. TASC4 controls and monitors the buffered output
compare function and TIMA channel 5 status and control register (TASC5) is unused. While the MS4B bit
is set, the channel 5 pin, PTF3, is available as a general-purpose I/O pin.
25.3.4 Pulse Width Modulation (PWM)
By using the toggle-on-overflow feature with an output compare channel, the TIMA can generate a PWM
signal. The value in the TIMA counter modulo registers determines the period of the PWM signal. The
channel pin toggles when the counter reaches the value in the TIMA counter modulo registers. The time
between overflows is the period of the PWM signal.
As
of the PWM signal. The time between overflow and output compare is the pulse width. Program the TIMA
to clear the channel pin on output compare if the polarity of the PWM pulse is 1. Program the TIMA to set
the pin if the polarity of the PWM pulse is 0.
The value in the TIMA counter modulo registers and the selected prescaler output determines the
frequency of the PWM output. The frequency of an 8-bit PWM signal is variable in 256 increments. Writing
$00FF (255) to the TIMA counter modulo registers produces a PWM period of 256 times the internal bus
clock period if the prescaler select value is $000 (see
The value in the TIMA channel registers determines the pulse width of the PWM output. The pulse width
of an 8-bit PWM signal is variable in 256 increments. Writing $0080 (128) to the TIMA channel registers
produces a duty cycle of 128/256 or 50%.
312
Figure 25-3
PTEx/TCHx
In buffered output compare operation, do not write new output compare
values to the currently active channel registers. User software should track
the currently active channel to prevent writing a new value to the active
channel. Writing to the active channel registers is the same as generating
unbuffered output compares.
shows, the output compare value in the TIMA channel registers determines the pulse width
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
OVERFLOW
Figure 25-3. PWM Period and Pulse Width
PULSE
WIDTH
PERIOD
COMPARE
OUTPUT
OVERFLOW
NOTE
25.8.1 TIMA Status and Control
COMPARE
OUTPUT
OVERFLOW
Freescale Semiconductor
COMPARE
OUTPUT
Register).

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