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| 型號(hào)： | MC68HC805K3DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁(yè)數(shù)： | 93/119頁(yè) |
| 文件大?。?/td> | 2870K |
| 代理商： | MC68HC805K3DW |
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General Release Specification
Timer Registers
MC68HC805K3 — Rev. 1.0
8-Bit Timer
75
RTIE — Real Time Interrupt Enable
The RTIE is an enable bit that allows the generation of a timer
interrupt. When the RTIE enable bit is set and the RTIF flag bit is set,
the timer interrupt is generated. The RTIE bit is cleared by reset.
TOFR — Timer Overflow Acknowledge
The TOFR is an acknowledge bit that resets the TOF flag bit. Writing
a logical one to the TOFR clears the TOF flag bit. Reading the TOFR
always returns a logical zero. This bit is unaffected by reset.
RTIFR — Real Time Interrupt Acknowledge
The RTIFR is an acknowledge bit that resets the RTIF flag bit. Writing
a logical one to the RTIFR clears the RTIF flag bit. Reading the RTIFR
always returns a logical zero. This bit is unaffected by reset.
RT1:RT0 — Real Time Interrupt Rate Select
The RT0 and RT1 control bits select one-of-four taps for the real time
interrupt circuit. Table 8-1 shows the available interrupt rates with
several fOP values. Both the RT0 and RT1 control bits are set by
reset, 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 can be missed or an additional RTIF can
be generated. To avoid problems, the COP should be cleared just
prior to changing RTI taps.
Table 8-1. RTI Rates and COP Reset Times
RT1:RT0
RTI
Rate
RTI Period
(f
OP = 2 MHz)
COP Timeout
Period
(
± 1 RTI Period)
Minimum COP
Timeout
Period
f
OP = 2 MHz)
00
f
OP ÷ 2
14
8.2 ms
8 x RTI Period
57.3 ms
01
f
OP ÷ 2
15
16.4 ms
8 x RTI Period
114.7 ms
10
f
OP ÷ 2
16
32.8 ms
8 x RTI Period
229.4 ms
11
f
OP ÷ 2
17
65.5 ms
8 x RTI Period
458.8 ms
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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