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| 型號： | MC68HC705V8CFN |
| 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, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 167/172頁 |
| 文件大小： | 890K |
| 代理商： | MC68HC705V8CFN |
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SECTION 12: CORE TIMER
MOTOROLA
Page 83
MC68HC705V8 Specification Rev. 2.1
12.1.6
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 zero.
12.1.7
RT1:RT0 - Real Time Interrupt Rate Select
These two bits select one of four taps from the Real Time Interrupt circuit. Table 12-1
shows the available interrupt rates with a 2.1 and 1.05MHz bus clock. 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 12-1: RTI and COP Rates at 2.1 MHz
12.2
COMPUTER OPERATING PROPERLY (COP) RESET
The COP watchdog timer function is implemented on this device by using the output of the
RTI circuit and further dividing it by eight. The minimum COP reset rates are listed in Table
12-1. If the COP circuit times out, an internal reset is generated and the normal reset vector
is fetched. Preventing a COP time-out, or clearing the COP, is accomplished by writing a
“0” to bit 0 of address $3FF0. When the COP is cleared, only the final divide by eight stage
(output of the RTI) is cleared.
If the COP watchdog timer is allowed to time-out, an internal reset is generated to reset the
MCU. In addition the RESET pin will be pulled low for a minimum of 3 E Clock cycle for
emulation purposes. During a chip reset (regardless of the source), the entire Core Timer
counter chain is cleared.
The COP will remain enabled after execution of the WAIT instruction and all associated
operations apply. If the STOP instruction is disabled, execution of STOP instruction will
cause an internal reset.
This COP’s objective is to make it impossible for this part to become “stuck” or “l(fā)ocked-up”
and to be sure the COP is able to “rescue” the part from any situation where it might entrap
itself in an abnormal or unintended behavior. This function is a mask option.
11
RT1:RT0
MIN. COP RATES
00
01
10
214/E
RTI RATE
211/E
212/E
213/E
15.60 ms
1.95 ms
3.90 ms
7.80 ms
0.97 ms
1.95 ms
3.90 ms
109.23ms
13.65ms
27.31ms
54.61ms
54.61 ms
6.83 ms
13.65 ms
27.31 ms
(217-214)/E
(214-211)/E
(215-212)/E
(216-213)/E
1.05 MHz
2.1 MHz
1.05 MHz
2.1 MHz
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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