S9S08DZ60F2MLH Freescale Semiconductor, S9S08DZ60F2MLH Datasheet - Page 402
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S9S08DZ60F2MLH
Manufacturer Part Number
S9S08DZ60F2MLH
Description
8-bit Microcontrollers - MCU M74K MASK ONLY-AUTO
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S08DZ60F2MLH.pdf
(416 pages)
Specifications of S9S08DZ60F2MLH
Rohs
yes
Core
HCS08
Processor Series
MC9S08DZ60
Data Bus Width
8 bit
Maximum Clock Frequency
40 MHz
Program Memory Size
60 KB
Data Ram Size
4 K
On-chip Adc
Yes
Operating Supply Voltage
2.7 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-64
Mounting Style
SMD/SMT
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Appendix B Timer Pulse-Width Modulator (TPMV2)
the value in the TPMxCNTH:TPMxCNTL counter is 0x0000. (The new duty cycle does not take effect
until the next full period.)
B.3.3
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 0x0001 to 0x7FFF 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%. If TPMxCnVH:TPMxCnVL is a positive value (bit 15 clear) and is greater than the (nonzero)
modulus setting, the duty cycle will be 100% because the duty cycle compare will never occur. This
implies the usable range of periods set by the modulus register is 0x0001 through 0x7FFE (0x7FFF if
generation of 100% duty cycle is not necessary). This is not a significant limitation because the resulting
period is much longer than required for normal applications.
TPMxMODH:TPMxMODL = 0x0000 is a special case that should not be used with center-aligned PWM
mode. When CPWMS = 0, this case corresponds to the counter running free from 0x0000 through
0xFFFF, but when CPWMS = 1 the counter needs a valid match to the modulus register somewhere other
than at 0x0000 in order to change directions from up-counting to down-counting.
Figure B-11
determines the pulse width (duty cycle) of the CPWM signal. If ELSnA = 0, the compare match while
counting up forces the CPWM output signal low and a compare match while counting down forces the
output high. The counter counts up until it reaches the modulo setting in TPMxMODH:TPMxMODL, then
counts down until it reaches zero. This sets the period equal to two times TPMxMODH:TPMxMODL.
Center-aligned PWM outputs typically produce less noise than edge-aligned PWMs because fewer I/O pin
transitions are lined up at the same system clock edge. This type of PWM is also required for some types
of motor drives.
402
Center-Aligned PWM Mode
shows the output compare value in the TPM channel registers (multiplied by 2), which
TPMxMODH:TPMx
TPM1C
COUNT =
Figure B-11. CPWM Period and Pulse Width (ELSnA = 0)
pulse width = 2 x (TPMxCnVH:TPMxCnVL)
period = 2 x (TPMxMODH:TPMxMODL);
MC9S08DZ60 Series Data Sheet, Rev. 4
for TPMxMODH:TPMxMODL = 0x0001–0x7FFF
(COUNT DOWN)
COMPARE
OUTPUT
2 x
2 x
PULSE WIDTH
COUNT = 0
PERIOD
(COUNT UP)
COMPARE
OUTPUT
TPMxMODH:TPMx
COUNT =
Freescale Semiconductor
Eqn. 17-1
Eqn. 17-2
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