參數(shù)資料
型號: GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時器參考手冊
文件頁數(shù): 44/90頁
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
6-4
PULSE-WIDTH MODULATION UNIT
GPT
REFERENCE MANUAL
When the MCU writes to register PWMA or PWMB, the new value will only be picked
up at the end of a complete cycle. This prevents the PWM from generating glitches
(erroneous data) when being updated. The current duty cycle value is in the PWMx
buffer register (PWMxBUF). The new value is transferred from the PWMx register to
PWMxBUF at the end of the current cycle.
The data and control registers, PWMA, PWMB, and PWMC are reset to $00 during
reset. These registers may be written or read at any time. PWMC is implemented as
the lower byte of a 16-bit register. The upper byte is the CFORC register. The buffer
registers, PWMABUF and PWMBBUF are read-only at all times and can be accessed
as separate bytes or as one 16-bit register.
6.3 PWM Registers
This section provides additional information on the registers in the PWM unit.
6.3.1 PWM Control Register (PWMC)
The PWMC register controls functioning of the PWM unit. Refer to
Figure 6-3
.
* These bits are part of the CFORC register. Refer to
3.3.4 Timer Compare Force Register (CFORC)
for details
on these bits.
FPWMA and FPWMB are also considered part of CFORC; however, they affect operation of the PWM unit and
can be accessed as part of PWMC when word accesses are used.
NOTE: The address shown is on a word boundary; however, the register can be accessed by a word or byte cycle.
Figure 6-3 PWM Control Register (PWMC)
FPWMx — Force PWM Value
0 = PWM pin x is used for PWM functions; normal operation.
1 = PWM pin x is used for discrete output. The value of the F1x bit will be driven
out on the PWMx pin. This is true for PWMA regardless of the state of the
PPROUT bit.
FPWMA and FPWMB are considered part of CFORC; however, they affect operation
of the PWM unit and can be accessed as part of PWMC when word accesses are
used.
PPROUT — PWM Prescaler Clock Output Enable
0 = Normal PWM operation on PWMA.
1 = Output of prescaler mux for PWM counter is driven out on the PWMA pin.
If not needed for the PWM function, the PWMA pin can be used to output the clock
selected as the input to the PWM count register. The clock does not have a 50% duty
cycle. It reflects the period of the selected clock and a pulse high time equal to one
PWMC —
PWM Control Register
$YFF924
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
FOC5*
FOC4*
FOC3*
FOC2*
FOC1*
0
FPWMA
FPWMB
PPROUT
PPR2
PPR1
PPR0 SFA
SFB
F1A
F1B
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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