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| 型號： | MC68HC912BL16FU8 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數(shù)： | 100/128頁 |
| 文件大小： | 3326K |
| 代理商： | MC68HC912BL16FU8 |
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MC68HC912BL16TS/D
73
by two to generate clock S1.
PWSCNT1 is a down-counter that, upon reaching $00, loads the value of PWSCAL1. Read any time.
Read and write anytime. A write will cause the PWM counter to reset to $00.
In special mode, if DISCR = 1, a write does not reset the PWM counter.
Each counter may be read any time without affecting the count or the operation of the corresponding
PWM channel. Writes to a counter cause the counter to be reset to $00 and force an immediate load of
both duty and period registers with new values. To avoid a truncated PWM period, write to a counter
while the counter is disabled. In left-aligned output mode, resetting the counter and starting the wave-
form output is controlled by a match between the period register and the value in the counter. In center-
aligned output mode the counters operate as up/down counters, where a match in period changes the
counter direction. The duty register changes the state of the output during the period to determine the
duty.
When a channel is enabled, the associated PWM counter starts at the count in the PWCNTx register
using the clock selected for that channel.
In special mode, when DISCP = 1 and configured for left-aligned output, a match of period does not
reset the associated PWM counter.
Read and write anytime.
The value in the period register determines the period of the associated PWM channel. If written while
the channel is enabled, the new value will not take effect until the existing period terminates, forcing the
counter to reset. The new period is then latched and is used until a new period value is written. Reading
this register returns the most recent value written. To start a new period immediately, write the new pe-
riod value and then write the counter forcing a new period to start with the new period value.
Period = Channel-Clock-Period
× (PWPER + 1)
(CENTR = 0)
Period = Channel-Clock-Period
× PWPER × 2
(CENTR = 1)
PWSCNT1 — PWM Scale Counter 1 Value
$0047
Bit 7
6
5
4
3
2
1
Bit 0
Bit 7
6
5
4
3
2
1
Bit 0
RESET:
0
PWCNTx — PWM Channel Counters
Bit 7
6
5
4
3
2
1
Bit 0
PWCNT0
Bit 7
6
5
4
3
2
1
Bit 0
$0048
PWCNT1
Bit 7
6
5
4
3
2
1
Bit 0
$0049
PWCNT2
Bit 7
6
5
4
3
2
1
Bit 0
$004A
PWCNT3
Bit 7
6
5
4
3
2
1
Bit 0
$004B
RESET:
0
PWPERx — PWM Channel Period Registers
Bit 7
6
5
4
3
2
1
Bit 0
PWPER0
Bit 7
6
5
4
3
2
1
Bit 0
$004C
PWPER1
Bit 7
6
5
4
3
2
1
Bit 0
$004D
PWPER2
Bit 7
6
5
4
3
2
1
Bit 0
$004E
PWPER3
Bit 7
6
5
4
3
2
1
Bit 0
$004F
RESET:
1
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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