参数资料
型号: MC68HC705RC17P
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.097 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 86/126页
文件大小: 3079K
代理商: MC68HC705RC17P
NON-DISCLOSURE
AGREEMENT
REQUIRED
Core Timer
General Release Specification
MC68HC705RC17 Rev. 2.0
Core Timer
TOFC — Timer Overflow Flag Clear
When a 1 is written to this bit, CTOF is cleared. Writing a 0 has no
effect on the CTOF bit. This bit always reads as 0.
RTFC — Real-Time Interrupt Flag Clear
When a 1 is written to this bit, RTIF is cleared. Writing a 0 has no effect
on the RTIF bit. This bit always reads as 0.
RT1 and RT0 — Real-Time Interrupt Rate Select
These two bits select one of four taps from the real-time interrupt
circuit. Refer to Table 8-1. Reset sets these two bits which selects the
lowest periodic rate and gives the maximum time in which to alter
these bits if necessary. Care should be taken when altering RT0 and
RT1 if the time out period is imminent or uncertain. If the selected tap
is modified during a cycle in which the counter is switching, an RTIF
could be missed or an additional one could be generated. To avoid
problems, the COP should be cleared before changing RTI taps.
Table 8-1. RTI and COP Rates at 4.096-MHz Oscillator
RTI Rate
2.048-MHz Bus
RT1 and RT0
Minimum COP Rates
2.048-MHz Bus
2 ms
212
÷ E00
(215–212)/E
14 ms
4 ms
213
÷ E01
(216–213)/E
28 ms
8 ms
214
÷ E10
(217–214)/E
56 ms
16 ms
215
÷ E11
(218–215)/E
112 ms
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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