參數(shù)資料
型號： MC68HC705E5P
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 103/148頁
文件大?。?/td> 3554K
代理商： MC68HC705E5P
NON-DISCLOSURE
AGREEMENT
REQUIRED
Timer
General Release Specification
MC68HC705E5 — Rev. 1.0
Timer
RTIE — Real-Time Interrupt Enable
When this bit is set, a CPU interrupt request is generated when the
RTIF bit is set. Reset clears this bit.
TOFA — Timer Over Flow Flag Acknowledge
When a one is written to this bit location, the TOF flag bit is cleared.
This bit always reads as a zero.
RTIFA — Real-Time Interrupt Flag Acknowledge
When a one is written to this bit location, the RTIF flag bit is cleared.
This bit always reads as a zero.
RT1–RT0 — Real-Time Interrupt Rate Select
These two bits select one of four taps from the real-time interrupt
circuit.Table 8-1 shows the available interrupt rates with several fop
values. Reset sets RT0 and RT1, selecting the lowest periodic rate
and therefore 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.
Table 8-1. RTI Rates
RT1–RT0
RT1 Rates at fop Frequency Specified
16.384 kHz
524 kHz
1.049 MHz
2.097 MHz
4.194 MHz
fop
00
1 s
31.3 ms
15.6 ms
7.8 ms
3.9 ms
214
÷ f
op
01
2 s
62.5 ms
31.3 ms
15.6 ms
7.8 ms
215
÷ f
op
10
4 s
125 ms
62.5 ms
31.3 ms
15.6 ms
216
÷ f
op
11
8 s
250 ms
125.1 ms
62.5 ms
31.3 ms
217
÷ f
op
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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