MC908GR32AMFAE Freescale Semiconductor, MC908GR32AMFAE Datasheet - Page 248
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MC908GR32AMFAE
Manufacturer Part Number
MC908GR32AMFAE
Description
IC MCU 8BIT 32K FLASH 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908GR32ACFJE.pdf
(314 pages)
Specifications of MC908GR32AMFAE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
37
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 24x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
MC908GR32AMFAE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Timer Interface Module (TIM2)
18.3.4 Pulse Width Modulation (PWM)
By using the toggle-on-overflow feature with an output compare channel, the TIM2 can generate a PWM
signal. The value in the TIM2 counter modulo registers determines the period of the PWM signal. The
channel pin toggles when the counter reaches the value in the TIM2 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 TIM2
to clear the channel pin on output compare if the polarity of the PWM pulse is 1 (ELSxA = 0). Program the
TIM2 to set the pin if the polarity of the PWM pulse is 0 (ELSxA = 1).
The value in the TIM2 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 TIM2 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 TIM2 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 TIM2 channel registers
produces a duty cycle of 128/256 or 50%.
18.3.4.1 Unbuffered PWM Signal Generation
Any output compare channel can generate unbuffered PWM pulses as described in
Modulation
pulse width value over the value currently in the TIM2 channel registers.
An unsynchronized write to the TIM2 channel registers to change a pulse width value could cause
incorrect operation for up to two PWM periods. For example, writing a new value before the counter
reaches the old value but after the counter reaches the new value prevents any compare during that PWM
period. Also, using a TIM2 overflow interrupt routine to write a new, smaller pulse width value may cause
the compare to be missed. The TIM2 may pass the new value before it is written to the timer channel
(T2CHxH:T2CHxL) registers.
248
Figure 18-4
(PWM). The pulses are unbuffered because changing the pulse width requires writing the new
POLARITY = 1
POLARITY = 0
(ELSxA = 0)
(ELSxA = 1)
channel. Writing to the active channel registers is the same as generating
unbuffered output compares.
shows, the output compare value in the TIM2 channel registers determines the pulse width
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
TCHx
TCHx
OVERFLOW
Figure 18-4. PWM Period and Pulse Width
PULSE
WIDTH
PERIOD
COMPARE
OUTPUT
OVERFLOW
18.8.1 TIM2 Status and Control
COMPARE
OUTPUT
OVERFLOW
Freescale Semiconductor
18.3.4 Pulse Width
Register).
COMPARE
OUTPUT
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