參數(shù)資料
型號(hào): GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時(shí)器參考手冊(cè)
文件頁(yè)數(shù): 84/90頁(yè)
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
A-8
MEMORY MAP AND REGISTERS
GPT
REFERENCE MANUAL
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.
PPROUT — PWM Prescaler Clock Output Enable
0 = Normal PWM operation on PWMA
1 = Output of prescaler mux for PWM counter driven out on the PWMA pin
PPR[2:0] — PWM Prescaler
These bits select a prescaler tap or the external clock, PCLK, to be the input to PWM-
CNT.
* PCLK is an external clock input pin.
SFx — Slow/Fast Bits
0 = The higher speed of PWMx is selected. (The PWMx period is 256 PWMCNT
increments long.)
1 = The slower speed of PWMx is selected. (The PWMx period is 32,768 PWMCNT
increments long.)
F1x — Force Logic One on PWMx
0 = Normal PWMx operation or force a zero on the PWMx pin for discrete output.
1 = Force one on the PWMx pin; a 100% duty cycle PWM or discrete output.
PWMA/PWMB
— PWM Registers A/B
These registers are associated with the pulse-width value of the PWM output on the
corresponding PWM pin. A value of $00 loaded into one of these registers results in a
continuously low output on the corresponding pin. A value of $80 results in a 50% duty
cycle output to the maximum value of $FF. This maximum value corresponds to an
output which is high for 255/256 of the period.
$YFF926, $YFF927
PWMCNT
— PWM Count Register
PWMCNT is the 16-bit free-running counter associated with the PWM functions of the
GPT module.
$YFF928
PPR[2:0]
System Clock
Divide-By Factor
2
4
8
16
32
64
128
PCLK*
000
001
010
011
100
101
110
111
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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