MC9S08GT60CFDER Freescale Semiconductor, MC9S08GT60CFDER Datasheet - Page 157
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MC9S08GT60CFDER
Manufacturer Part Number
MC9S08GT60CFDER
Description
IC MCU 60K FLASH 4K RAM 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.M68EVB908GB60E.pdf
(290 pages)
Specifications of MC9S08GT60CFDER
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
39
Program Memory Size
60KB (60K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-QFN
For Use With
M68DEMO908GB60E - BOARD DEMO MC9S08GB60M68EVB908GB60E - BOARD EVAL FOR MC9S08GB60
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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register (TPMxCnVH:TPMxCnVL). The polarity of this PWM signal is determined by the setting in the
ELSnA control bit. Duty cycle cases of 0 percent and 100 percent are possible.
As
(duty cycle) of the PWM signal. The time between the modulus overflow and the output compare is the
pulse width. If ELSnA = 0, the counter overflow forces the PWM signal high and the output compare
forces the PWM signal low. If ELSnA = 1, the counter overflow forces the PWM signal low and the output
compare forces the PWM signal high.
When the channel value register is set to $0000, the duty cycle is 0 percent. By setting the timer channel
value register (TPMxCnVH:TPMxCnVL) to a value greater than the modulus setting, 100 percent duty
cycle can be achieved. This implies that the modulus setting must be less than $FFFF to get 100 percent
duty cycle.
Because the HCS08 is a family of 8-bit MCUs, the settings in the timer channel registers are buffered to
ensure coherent 16-bit updates and to avoid unexpected PWM pulse widths. Writes to either register,
TPMxCnVH or TPMxCnVL, write to buffer registers. In edge-PWM mode, values are transferred to the
corresponding timer channel registers only after both 8-bit bytes of a 16-bit register have been written and
the value in the TPMxCNTH:TPMxCNTL counter is $0000. (The new duty cycle does not take effect until
the next full period.)
10.5.3
This type of PWM output uses the up-/down-counting mode of the timer counter (CPWMS = 1). The
output compare value in TPMxCnVH:TPMxCnVL determines the pulse width (duty cycle) of the PWM
signal and the period is determined by the value in TPMxMODH:TPMxMODL.
TPMxMODH:TPMxMODL should be kept in the range of $0001 to $7FFF because values outside this
range can produce ambiguous results. ELSnA will determine the polarity of the CPWM output.
If the channel value register TPMxCnVH:TPMxCnVL is zero or negative (bit 15 set), the duty cycle will
be 0 percent. If TPMxCnVH:TPMxCnVL is a positive value (bit 15 clear) and is greater than the (nonzero)
modulus setting, the duty cycle will be 100 percent because the duty cycle compare will never occur. This
implies the usable range of periods set by the modulus register is $0001 through $7FFE ($7FFF if
Freescale Semiconductor
Figure 10-3
Center-Aligned PWM Mode
shows, the output compare value in the TPM channel registers determines the pulse width
TPMxC
OVERFLOW
Figure 10-3. PWM Period and Pulse Width (ELSnA = 0)
pulse width = 2 x (TPMxCnVH:TPMxCnVL)
PULSE
WIDTH
period = 2 x (TPMxMODH:TPMxMODL);
PERIOD
MC9S08GB/GT Data Sheet, Rev. 2.3
COMPARE
for TPMxMODH:TPMxMODL = $0001–$7FFF
OUTPUT
OVERFLOW
COMPARE
OUTPUT
OVERFLOW
COMPARE
OUTPUT
Functional Description
Eqn. 10-1
Eqn. 10-2
157
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