參數(shù)資料
型號： MC68HC908RK2DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封裝： PLASTIC, SOIC-20
文件頁數(shù)： 31/158頁
文件大?。?/td> 1020K
代理商： MC68HC908RK2DW
Timer Interface Module (TIM)
MC68HC908RK2 Data Sheet, Rev. 5.1
126
Freescale Semiconductor
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 percent duty
cycle output.
Setting the channel x maximum duty cycle bit (CHxMAX) and clearing the TOVx bit generates a 100
11.5 Interrupts
These TIM sources can generate interrupt requests:
TIM overflow flag (TOF) — The TOF bit is set when the TIM counter value rolls over to $0000 after
matching the value 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 and 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.
11.5.1 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
11.5.2 Wait 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.
11.5.3 Stop Mode
The TIM is inactive after the execution of a STOP instruction. The STOP instruction does not affect
register conditions or the state of the TIM counter. TIM operation resumes when the MCU exits stop mode
after an external interrupt.
11.6 TIM During Break Interrupts
A break interrupt stops the TIM counter.
The system integration module (SIM) controls whether status bits in other modules can be cleared during
the break state. The BCFE bit in the SIM break flag control register (SBFCR) enables software to clear
status bits during the break state. See 10.7.3 SIM Break Flag Control Register.
To allow software to clear status bits during a break interrupt, write a 1 to the BCFE bit. If a status bit is
cleared during the break state, it remains cleared when the MCU exits the break state.
To protect status bits during the break state, write a 0 to the BCFE bit. With BCFE at 0 (its default state),
software can read and write I/O registers during the break state without affecting status bits. Some status
bits have a 2-step read/write clearing procedure. If software does the first step on such a bit before the
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