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| 型號(hào)： | S908QC16CDRER |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | 4.40 MM, 1.20 MM HEIGHT, 0.65 MM PITCH, LEAD FREE, MO-153AE, TSSOP-28 |
| 文件頁(yè)數(shù)： | 106/274頁(yè) |
| 文件大小： | 3183K |
| 代理商： | S908QC16CDRER |
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Timer Interface Module (TIM1)
MC68HC908QC16 MC68HC908QC8 MC68HC908QC4 Data Sheet, Rev. 5
194
Freescale Semiconductor
The value in the TIM1 counter modulo registers and the selected prescaler output determines the
frequency of the PWM output The frequency of an 8-bit PWM signal is variable in 256 increments. Writing
$00FF (255) to the TIM1 counter modulo registers produces a PWM period of 256 times the internal bus
clock period if the prescaler select value is 000. See 16.8.1 TIM1 Status and Control Register.
The value in the TIM1 channel registers determines the pulse width of the PWM output. The pulse width
of an 8-bit PWM signal is variable in 256 increments. Writing $0080 (128) to the TIM1 channel registers
produces a duty cycle of 128/256 or 50%.
16.3.4.1 Unbuffered PWM Signal Generation
Any output compare channel can generate unbuffered PWM pulses as described in 16.3.4 Pulse Width
Modulation (PWM). The pulses are unbuffered because changing the pulse width requires writing the new
pulse width value over the old value currently in the TIM1 channel registers.
An unsynchronized write to the TIM1 channel registers to change a pulse width value could cause
incorrect operation for up to two PWM periods. For example, writing a new value before the counter
reaches the old value but after the counter reaches the new value prevents any compare during that PWM
period. Also, using a TIM1 overflow interrupt routine to write a new, smaller pulse width value may cause
the compare to be missed. The TIM1 may pass the new value before it is written to the timer channel
(T1CHxH:T1CHxL).
Use the following methods to synchronize unbuffered changes in the PWM pulse width on channel x:
When changing to a shorter pulse width, enable channel x output compare interrupts and write the
new value in the output compare interrupt routine. The output compare interrupt occurs at the end
of the current pulse. The interrupt routine has until the end of the PWM period to write the new
value.
When changing to a longer pulse width, enable TIM1 overflow interrupts and write the new value
in the TIM1 overflow interrupt routine. The TIM1 overflow interrupt occurs at the end of the current
PWM period. Writing a larger value in an output compare interrupt routine (at the end of the current
pulse) could cause two output compares to occur in the same PWM period.
NOTE
In PWM signal generation, do not program the PWM channel to toggle on
output compare. Toggling on output compare prevents reliable 0% duty
cycle generation and removes the ability of the channel to self-correct in the
event of software error or noise. Toggling on output compare also can
cause incorrect PWM signal generation when changing the PWM pulse
width to a new, much larger value.
16.3.4.2 Buffered PWM Signal Generation
Channels 0 and 1 can be linked to form a buffered PWM channel whose output appears on the T1CH0
pin. The TIM1 channel registers of the linked pair alternately control the output.
Setting the MS0B bit in TIM1 channel 0 status and control register (T1SC0) links channel 0 and channel 1.
The TIM1 channel 0 registers initially control the pulse width on the T1CH0 pin. Writing to the TIM1
channel 1 registers enables the TIM1 channel 1 registers to synchronously control the pulse width at the
beginning of the next PWM period. At each subsequent overflow, the TIM1 channel registers (0 or 1) that
control the pulse width are the ones written to last. T1SC0 controls and monitors the buffered PWM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC908QC16CDRE | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| MC908QC16CDTE | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16 |
| S912XDP512F0VPV | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP112 |
| MC312XDP512J1MPVR | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP112 |
| MC912XDP512F0MPVR | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP112 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S908QC16CDSE | 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 20TSSOP - Bulk |
| S908QC16CDSER | 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 20TSSOP - Tape and Reel |
| S908QC16CDTE | 制造商:Freescale Semiconductor 功能描述: 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 16TSSOP - Bulk |
| S908QC16CDTER | 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 16TSSOP - Tape and Reel |
| S908QC16CDXER | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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