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| 型号： | MC68HC711EA9MFN3 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PQCC52 |
| 封装： | PLASTIC, LCC-52 |
| 文件页数： | 25/58页 |
| 文件大小： | 583K |
| 代理商： | MC68HC711EA9MFN3 |
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MC68HC11EA9
MOTOROLA
MC68HC11EA9TS/D
31
7 Timing System
The timing system is based on a free-running 16-bit counter with a four-stage programmable prescaler.
A timer overflow function allows software to extend the system’s timing capability beyond the counter's
16-bit range. The main timer consists of the timer prescaler, the 16-bit free-running counter, and the
capture/compare unit. 7.2 Main Timer details this portion of the timing system.
The free-running counter can be driven by either the EXTAL signal, as in other M68HC11 derivatives
or it can be driven by a software-controlled phase-locked loop (PLL) frequency synthesizer which has
been added to the MC68HC(7)11EA9 MCUs. The PLL allows the MCU to operate in WAIT mode with
extremely low power requirements. Refer to 7.1 Phase-Locked Loop Synthesizer.
In addition, the timing system includes pulse accumulator and real-time interrupt (RTI) functions, as well
as a clock monitor function, which can be used to detect clock failures that are not detected by the COP
system. Refer to the appropriate paragraphs within this section for information regarding these func-
tions. Table 12 shows a summary of the crystal-related frequencies and periods.
Table 12 Timer Summary
Control Bits
Common System Frequencies
Definition
4.0 MHz
8.0 MHz
12.0 MHz
XTAL
1.0 MHz
2.0 MHz
3.0 MHz
E
PR[1:0]
Main Timer Count Rate (Period Length)
0 0
1 count —
1000 ns
500 ns
333 ns
1/E
overflow —
65.536 ms
32.768 ms
21.845 ms
216/E
0 1
1 count —
4.0
s
2.0
s
1.333
s
4/E
overflow —
262.14 ms
131.07 ms
32.768 ms
218/E
1 0
1 count —
8.0
s
4.0
s
2.667
s
8/E
overflow —
524.28 ms
262.14 ms
174.76 ms
219/E
1 1
1 count —
16.0
s
8.0
s
5.333
s
16/E
overflow —
1.049 s
524.29 ms
349.52 ms
220/E
RTR[1:0]
Periodic (RTI) Interrupt Rates (Period Length)
0 0
8.192 ms
4.096 ms
2.731 ms
213/E
0 1
16.384 ms
8.192 ms
5.461 ms
214/E
1 0
32.768 ms
16.384 ms
10.923 ms
215/E
1 1
65.536 ms
32.768 ms
21.845 ms
216/E
CR[1:0]
COP Watchdog Timeout Rates (Period Length)
0 0
32.768 ms
16.384 ms
10.923 ms
215/E
0 1
131.072 ms
65.536 ms
43.691 ms
217/E
1 0
524.288 ms
262.14 ms
174.76 ms
219/E
1 1
2.098 s
1.049 s
699.05 ms
221/E
Time-out Tolerance
(–0 ms/+...)
32.8 ms
16.4 ms
10.9 ms
215/E
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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