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| 型號(hào)： | MC908QF4CFJ |
| 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, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁(yè)數(shù)： | 48/196頁(yè) |
| 文件大?。?/td> | 2909K |
| 代理商： | MC908QF4CFJ |
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Timer Interface Module (TIM)
Functional Description
MC68HC908QF4 — Rev. 1.0
Data Sheet
MOTOROLA
Timer Interface Module (TIM)
141
15.4.1 TIM Counter Prescaler
The TIM clock source is one of the seven prescaler outputs or the TIM clock pin,
TCLK. The prescaler generates seven clock rates from the internal bus clock. The
prescaler select bits, PS[2:0], in the TIM status and control register (TSC) select
the TIM clock source.
15.4.2 Input Capture
With the input capture function, the TIM can capture the time at which an external
event occurs. When an active edge occurs on the pin of an input capture channel,
the TIM latches the contents of the TIM counter into the TIM channel registers,
TCHxH:TCHxL. The polarity of the active edge is programmable. Input captures
can generate TIM central processor unit (CPU) interrupt requests.
15.4.3 Output Compare
With the output compare function, the TIM can generate a periodic pulse with a
programmable polarity, duration, and frequency. When the counter reaches the
value in the registers of an output compare channel, the TIM can set, clear, or
toggle the channel pin. Output compares can generate TIM CPU interrupt
requests.
15.4.3.1 Unbuffered Output Compare
Any output compare channel can generate unbuffered output compare pulses as
described in 15.4.3 Output Compare. The pulses are unbuffered because
changing the output compare value requires writing the new value over the old
value currently in the TIM channel registers.
An unsynchronized write to the TIM channel registers to change an output compare
value could cause incorrect operation for up to two counter overflow 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 counter overflow
period. Also, using a TIM overflow interrupt routine to write a new, smaller output
compare value may cause the compare to be missed. The TIM may pass the new
value before it is written.
Use the following methods to synchronize unbuffered changes in the output
compare value on channel x:
When changing to a smaller value, 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 output
compare pulse. The interrupt routine has until the end of the counter
overflow period to write the new value.
When changing to a larger output compare value, enable TIM overflow
interrupts and write the new value in the TIM overflow interrupt routine. The
TIM overflow interrupt occurs at the end of the current counter overflow
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC908QF4FJ | 功能描述:IC MCU 4K FLASH W/RF 32-LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC08 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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