參數(shù)資料
型號: MC68HSC05J1A
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 74/128頁
文件大?。?/td> 1620K
代理商: MC68HSC05J1A
Technical Data
MC68HC05J1A — Rev. 3.0
74
Multifunction Timer
MOTOROLA
Multifunction Timer
RTIE — Real-Time Interrupt Enable Bit
This read/write bit enables real-time interrupts.
1 = Real-time interrupts enabled
0 = Real-time interrupts disabled
TOFR — Timer Overflow Flag Reset Bit
Writing a logic 1 to this write-only bit clears the TOF bit. TOFR always
reads as logic 0. Reset clears TOFR.
RTIFR — Real-Time Interrupt Flag Reset Bit
Writing a logic 1 to this write-only bit clears the RTIF bit. RTIFR
always reads as logic 0. Reset clears RTIFR.
RT1 and RT0 — Real-Time Interrupt Select Bits 1 and 0
These read/write bits select one of four RTI 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.
NOTE:
Changing RT1 and RT0 when a COP timeout is imminent or uncertain
may cause a real-time interrupt request to be missed or an additional
real-time interrupt 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
μ
s per cycle
Number
of Cycles
to COP Reset
COP Timeout
Period
(1)
0 0
2
14
= 16,384
8.2 ms
2
17
= 131,072
65.5 ms
0 1
2
15
= 32,768
16.4 ms
2
18
= 262,144
131.1 ms
1 0
2
16
= 65,536
32.8 ms
2
19
= 524,288
262.1 ms
1 1
2
17
= 131,072
65.5 ms
2
20
= 1,048,576
524.3 ms
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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