MC908AZ60ACFU Freescale Semiconductor, MC908AZ60ACFU Datasheet - Page 314
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MC908AZ60ACFU
Manufacturer Part Number
MC908AZ60ACFU
Description
IC MCU FLASH 8.4MHZ 60K 64QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AZ60ACFUER.pdf
(414 pages)
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)
(2 or 3) that control the pulse width are the ones written to last. TASC2 controls and monitors the buffered
PWM function and TIMA channel 3 status and control register (TASC3) is unused. While the MS2B bit is
set, the channel 3 pin, PTF1/TACH3, is available as a general-purpose I/O pin.
Channels 4 and 5 can be linked to form a buffered PWM channel whose output appears on the PTF2 pin.
The TIMA channel registers of the linked pair alternately control the pulse width of the output.
Setting the MS4B bit in TIMA channel 4 status and control register (TASC4) links channel 4 and
channel 5. The TIMA channel 4 registers initially control the pulse width on the PTF2 pin. Writing to the
TIMA channel 5 registers enables the TIMA channel 5 registers to synchronously control the pulse width
at the beginning of the next PWM period. At each subsequent overflow, the TIMA channel registers (4 or
5) that control the pulse width are the ones written to last. TASC4 controls and monitors the buffered PWM
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.
25.3.4.3 PWM Initialization
To ensure correct operation when generating unbuffered or buffered PWM signals, use the following
initialization procedure:
314
1. In the TIMA status and control register (TASC):
2. In the TIMA counter modulo registers (TAMODH–TAMODL) write the value for the required PWM
3. In the TIMA channel x registers (TACHxH–TACHxL) write the value for the required pulse width.
4. In TIMA channel x status and control register (TASCx):
5. In the TIMA status control register (TASC) clear the TIMA stop bit, TSTOP.
period.
a. Stop the TIMA counter by setting the TIMA stop bit, TSTOP.
b. Reset the TIMA counter and prescaler by setting the TIMA reset bit, TRST.
a. Write 0:1 (for unbuffered output compare or PWM signals) or 1:0 (for buffered output compare
b. Write 1 to the toggle-on-overflow bit, TOVx.
c. Write 1:0 (to clear output on compare) or 1:1 (to set output on compare) to the edge/level
or PWM signals) to the mode select bits, MSxB–MSxA (see
select bits, ELSxB–ELSxA. The output action on compare must force the output to the
complement of the pulse width level (see
In buffered PWM signal generation, do not write new pulse width 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 PWM signals.
In PWM signal generation, do not program the PWM channel to toggle on
output compare. Toggling on output compare prevents reliable 0% duty
cycle generation and removes the ability of the channel to self-correct in the
event of software error or noise. Toggling on output compare can also
cause incorrect PWM signal generation when changing the PWM pulse
width to a new, much larger value.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
NOTE
NOTE
Table
25-2).
Table
25-2).
Freescale Semiconductor
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