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| 型号： | MC68HC05E1DWR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | SOIC-28 |
| 文件页数： | 60/86页 |
| 文件大小： | 491K |
| 代理商： | MC68HC05E1DWR2 |
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Timer, Phase-Locked Loop, and Custom Periodic Interrupt
Timer
MC68HC05E1 — Revision 2.0
General Release Specication
MOTOROLA
Timer, Phase-Locked Loop, and Custom Periodic Interrupt
63
6.3.3 Timer Control Register (TCR) $09
The Timer Counter Register is a read-only register which contains the
current value of the 8-bit ripple counter at the beginning of the timer
chain. This counter is clocked at fop divided by 4 and can be used for
various functions including a software input capture. Extended time
periods can be attained using the TOF function to increment a temporary
RAM storage location thereby simulating a 16-bit (or more) counter.
Figure 6-3. Timer Counter Register
The power-on cycle clears the entire counter chain and begins clocking
the counter. After 4064 cycles, the power-on reset circuit is released
which again clears the counter chain and allows the device to come out
of reset. At this point, if RESET is not asserted, the timer will start
counting up from zero and normal device operation will begin. When
RESET is asserted anytime during operation (other than POR), the
counter chain will be cleared.
Table 6-2. COP Reset Times
RT1:RT0
RTI RATES AT fOP FREQUENCY SPECIFIED:
16.384 kHz
524 kHz
1.049 MHz
2.097 MHz
4.194 MHz
fOP
00
7 s
218.8 ms
109.4 ms
54.7 ms
27.3 ms
7 x (RTI Rate)
01
14 s
437.5 ms
218.8 ms
109.4 ms
54.7 ms
7 x (RTI Rate)
10
28 s
875.0 ms
437.5 ms
218.8 ms
109.4 ms
7 x (RTI Rate)
11
56 s
1.75 s
875.0 ms
437.5 ms
218.8 ms
7 x (RTI Rate)
$09
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