MC68HC908QT2CDW Freescale Semiconductor, MC68HC908QT2CDW Datasheet - Page 123

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MC68HC908QT2CDW

Manufacturer Part Number
MC68HC908QT2CDW
Description
IC MCU 1.5K FLASH W/ADC 8-SOIC
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC68HC908QT2CDW

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, PWM
Number Of I /o
5
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Connectivity
-

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control the output are the ones written to last. TSC0 controls and monitors the buffered output compare
function, and TIM channel 1 status and control register (TSC1) is unused. While the MS0B bit is set, the
channel 1 pin, TCH1, is available as a general-purpose I/O pin.
14.4.4 Pulse Width Modulation (PWM)
By using the toggle-on-overflow feature with an output compare channel, the TIM can generate a PWM
signal. The value in the TIM counter modulo registers determines the period of the PWM signal. The
channel pin toggles when the counter reaches the value in the TIM 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 TIM
to clear the channel pin on output compare if the state of the PWM pulse is logic 1 (ELSxA = 0). Program
the TIM to set the pin if the state of the PWM pulse is logic 0 (ELSxA = 1).
The value in the TIM 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 TIM 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 TIM 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 TIM channel registers
produces a duty cycle of 128/256 or 50%.
Freescale Semiconductor
Figure 14-3
POLARITY = 1
POLARITY = 0
(ELSxA = 0)
(ELSxA = 1)
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 TIM channel registers determines the pulse width
TCHx
TCHx
OVERFLOW
Figure 14-3. PWM Period and Pulse Width
MC68HC908QY/QT Family Data Sheet, Rev. 6
PULSE
WIDTH
PERIOD
COMPARE
OUTPUT
OVERFLOW
NOTE
14.9.1 TIM Status and Control
COMPARE
OUTPUT
OVERFLOW
Functional Description
Register.
COMPARE
OUTPUT
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