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参数资料
| 型号： | MC68HC705J2CP |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20 |
| 封装： | PLASTIC, DIP-20 |
| 文件页数： | 40/82页 |
| 文件大小： | 2545K |
| 代理商： | MC68HC705J2CP |
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TIMER
Rev. 2
7-3
1
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15
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20
TOF — Timer Overflow Flag
This clearable, read-only bit becomes set when the first eight stages of the counter
roll over from $FF to $00. TOF generates a timer overflow interrupt request if
TOFE is also set. Clear TOF by writing a zero to it. Writing a one to TOF has no
effect.
RTIF — Real-Time Interrupt Flag
This clearable, read-only bit becomes set when the selected RTI output becomes
active. RTIF generates a real-time interrupt request if RTIE is also set. Clear RTIF
by writing a zero to it. Writing a one to RTIF has no effect.
TOIE — Timer Overflow Interrupt Enable
This read/write bit enables timer overflow interrupts.
1 = Timer overflow interrupts enabled
0 = Timer overflow interrupts disabled
RTIE — Real-Time Interrupt Enable
This read/write bit enables real-time interrupts
1 = Real-time interrupts enabled
0 = Real-time interrupts disabled
Bits 3 and 2 — Not used. Always read as zeros.
RT1, RT0 — Real-Time 1 and 0
These read/write bits select one of four real-time interrupt rates. See Table 7-1.
The real-time interrupt rate should be selected by reset initialization software. A
reset sets both RT1 and RT0, selecting the lowest real-time interrupt rate.
Changing the real-time interrupt rate near the end of the RTI period or during a
cycle in which the counter is switching can produce unpredictable results.
Because the selected RTI output drives the COP timer, changing the real-time
interrupt rate also changes the counting rate of the COP timer.
Table 7-1. Real-Time Interrupt Rate Selection
RT1:RT0
RTI Rate
RTI Period
(fop = 2 MHz)
COP Timeout Period
(-0/+1 RTI Period)
Minimum COP Timeout
Period ( fop = 2 MHz)
0 0
fop ÷ 2
14
8.2 ms
7
× RTI Period
57.3 ms
0 1
fop ÷ 2
15
16.4 ms
7
× RTI Period
114.7 ms
1 0
fop ÷ 2
16
32.8 ms
7
× RTI Period
229.4 ms
1 1
fop ÷ 2
17
65.5 ms
7
× 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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