参数资料
型号: MC68HC705K1CDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
封装: SOIC-16
文件页数: 117/140页
文件大小: 3196K
代理商: MC68HC705K1CDW
Technical Data
MC68HC705K1 — Rev. 2.0
Multifunction Timer
Multifunction Timer
RTIE — Real-Time Interrupt Enable Bit
This read/write bit enables real-time interrupts. Reset clears RTIE.
1 = Real-time interrupts enabled
0 = Real-time interrupts disabled
TOFR — Timer Overflow Flag Reset
Writing a logic 1 to this write-only bit clears the TOF bit. TOFR always
reads as a logic 0. Reset does not affect TOFR.
RTIFR — Real-Time Interrupt Flag Reset
Writing a logic 1 to this write-only bit clears the RTIF bit. RTIFR
always reads as a logic 0. Reset does not affect RTIFR.
RT1 and RT0 — Real-Time Interrupt Select Bits 1 and 0
These read/write bits select one of four real-time interrupt rates, as
shown in Table 8-1. Because the selected RTI output drives the COP
watchdog, changing the real-time interrupt rate also changes the
counting rate of the COP watchdog. Reset sets RT1 and RT0,
selecting the longest COP timeout period and RTI period.
NOTE:
Changing RT1 and RT0 when a COP timeout is imminent or uncertain
may cause an RTI request to be missed or an additional RTI request to
be generated. Clear the COP timer just before changing RT1 and RT0.
Table 8-1. Real-Time Interrupt Rate Selection
RT1:RT0
Number
of Cycles
to RTI
RTI
Period(1)
1. At 2-MHz bus, 4-MHz XTAL, 0.5
s per cycle
Number
of Cycles
to COP Reset
COP Timeout
Period(1)
0 0
214 = 16,384
8.2 ms
217 = 131,072
65.5 ms
0 1
215 = 32,768
16.4 ms
218 = 262,144
131.1 ms
1 0
216 = 65,536
32.8 ms
219 = 524,288
262.1 ms
1 1
217 = 131,072
65.5 ms
220 = 1,048,576
524.3 ms
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For More Information On This Product,
Go to: www.freescale.com
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