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參數(shù)資料
| 型號(hào)： | MC68HLC908QT1DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 2 MHz, MICROCONTROLLER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 43/186頁(yè) |
| 文件大?。?/td> | 2765K |
| 代理商： | MC68HLC908QT1DW |
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Timer Interface Module (TIM)
Interrupts
MC68HLC908QY/QT Family — Rev. 2
Data Sheet
MOTOROLA
Timer Interface Module (TIM)
137
or noise. Toggling on output compare can also cause incorrect PWM signal
generation when changing the PWM pulse width to a new, much larger value.
5.
In the TIM status control register (TSC), clear the TIM stop bit, TSTOP.
Setting MS0B links channels 0 and 1 and configures them for buffered PWM
operation. The TIM channel 0 registers (TCH0H:TCH0L) initially control the
buffered PWM output. TIM status control register 0 (TSCR0) controls and monitors
the PWM signal from the linked channels. MS0B takes priority over MS0A.
Clearing the toggle-on-overflow bit, TOVx, inhibits output toggles on TIM overflows.
Subsequent output compares try to force the output to a state it is already in and
have no effect. The result is a 0% duty cycle output.
Setting the channel x maximum duty cycle bit (CHxMAX) and setting the TOVx bit
generates a 100% duty cycle output. See 14.9.4 TIM Channel Status and Control
14.5 Interrupts
The following TIM sources can generate interrupt requests:
TIM overflow flag (TOF) — The TOF bit is set when the TIM counter reaches
the modulo value programmed in the TIM counter modulo registers. The TIM
overflow interrupt enable bit, TOIE, enables TIM overflow CPU interrupt
requests. TOF and TOIE are in the TIM status and control register.
TIM channel flags (CH1F:CH0F) — The CHxF bit is set when an input
capture or output compare occurs on channel x. Channel x TIM CPU
interrupt requests are controlled by the channel x interrupt enable bit,
CHxIE. Channel x TIM CPU interrupt requests are enabled when CHxIE =1.
CHxF and CHxIE are in the TIM channel x status and control register.
14.6 Wait Mode
The WAIT instruction puts the MCU in low power-consumption standby mode.
The TIM remains active after the execution of a WAIT instruction. In wait mode the
TIM registers are not accessible by the CPU. Any enabled CPU interrupt request
from the TIM can bring the MCU out of wait mode.
If TIM functions are not required during wait mode, reduce power consumption by
stopping the TIM before executing the WAIT instruction.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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