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
文件頁數(shù): 54/90頁
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
8-2
GENERAL-PURPOSE I/O
GPT
REFERENCE MANUAL
8.1.1 Uni-Directional I/O
The input capture and output capture pins are bidirectional. They can be input or out-
puts. There are two GPT pins that can serve as general-purpose input and two pins
that can serve as outputs.
The pulse accumulator input (PAI) and the external clock input (PCLK) pins provide
general purpose input. The state of these pins can be read by accessing the PAIS and
PCLKS bits in the pulse accumulator control register (PACTL). Refer to
Figure 8-2
.
* Refer to
4.1.1 Pulse Accumulator Register/Pulse Accumulator Counter (PACTL/PACNT)
for information on
these bits.
Figure 8-2 PAIS and PCLKS Bits
PAIS — PAI Pin State (Read-Only)
PCLKS — PCLK Pin State (Read-Only)
The pulse-width modulation A and B (PWMA/PWMB) output pins can serve as gener-
al-purpose output pins. The force PWM value (FPWMx) and the force logic one (F1x)
bits in the compare force (CFORC) and PWM control (PWMC) registers, respectively,
control their operation. Refer to
Figure 8-3
for bit locations.
The FPWMx bit must be written to a logic level one to allow the pins to be used as dis-
crete outputs. The logic level written to the F1x bits are then output to the correspond-
ing pin.
* Refer to
3.3.4 Timer Compare Force Register (CFORC)
and
6.3.1 PWM Control Register (PWMC)
for infor-
mation on these bits.
Figure 8-3 Force PWM Bits
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.
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
PACTL —
Pulse Accumulator Control Register
$YFF90C
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PAIS
PAEN*
PAMOD* PEDGE*
PCLKS
I4/O5*
PACLK1* PACLK0*
PULSE ACCUMULATOR COUNTER*
RESET:
U
0
0
0
U
0
0
0
0
0
0
0
0
0
0
0
CFORC/PWMC —
Compare Force Register/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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