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(shí)器參考手冊
文件頁數(shù): 38/90頁
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
5-2
PRESCALER
GPT
REFERENCE MANUAL
The system clock is divided by a nine-stage divider chain which provides outputs of
the system clock divided by 2, 4, 8, 16, 32, 64, 128, 256, and 512. Connected to the
outputs of the divider are two multiplexers, one for the compare/capture unit, the other
for the PWM unit. These provide one of seven taps, plus an external input from the
PCLK pin to the PWM and compare/capture units. The outputs of the multiplexers
(muxs) are controlled by bits CPR[2:0] in the timer interrupt mask register 2 (TMSK2)
for TCNT and bits PPR[2:0] in the PWM control register (PWMC) for the PWM counter
(PWMCNT).
Table 5-1
and
Table 5-2
show the encoding of these bits. Refer to
7.1.3.1
Timer Interrupt Mask Registers 1–2 (TMSK1/TMSK2)
for more information on
TMSK2 and
6.3.1 PWM Control Register (PWMC)
for details on this register.
* PCLK is an external clock input pin.
* PCLK is an external clock input pin.
After reset, these bits are cleared, and the GPT is configured to use the system clock
divided by four for TCNT, and the system clock divided by two for PWMCNT. Initializa-
tion software may change the division factor by writing to these bits. The bits for the
PWM unit can be written at any time, but the bits for the compare/capture unit can only
be written once except when the GPT is in test or freeze mode.
NOTE
Changing the prescaler control bits while the prescaler is running
may cause an extra count if the input clock previously selected was
a logic level zero, and the new input clock logic level is one.
Table 5-1 Prescaler Select for Compare/Capture Unit
CPR[2:0]
System Clock
Divide-By Factor
4
8
16
32
64
128
256
PCLK*
000
001
010
011
100
101
110
111
Table 5-2 Prescaler Select for PWM Unit
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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