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参数资料
型号： MC68HC11F1CFN2R2
厂商： MOTOROLA INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PQCC68
封装： PLASTIC, LCC-68
文件页数： 12/163页
文件大小： 711K
代理商： MC68HC11F1CFN2R2
MC68HC11F1
TIMING SYSTEM
MOTOROLA
TECHNICAL DATA
9-3
9.1 Timer Structure
Figure 9-2 shows the capture/compare system block diagram. The port A pin control
block includes logic for timer functions and for general-purpose I/O. For pins PA3,
PA2, PA1, and PA0, this block contains both the edge-detection logic and the control
logic that enables the selection of which edge triggers an input capture. The digital lev-
el on PA[3:0] can be read at any time (read PORTA register), even if the pin is being
used for the input capture function. Pins PA[6:3] are used for either general-purpose
I/O, or as output compare pins. When one of these pins is being used for an output
compare function, it cannot be written directly as if it were a general-purpose output.
Each of the output compare functions (OC[5:2]) is related to one of the port A output
pins. Output compare one (OC1) has extra control logic, allowing it optional control of
any combination of the PA[7:3] pins. The PA7 pin can be used as a general-purpose
I/O pin, as an input to the pulse accumulator, or as an OC1 output pin.
Table 9-1 Timer Summary
XTAL Frequencies
4.0 MHz
8.0 MHz
12.0 MHz
16.0 MHz
Other Rates
1.0 MHz
2.0 MHz
3.0 MHz
4.0 MHz
(E)
Control Bits
1000 ns
500 ns
333 ns
250 ns
(1/E)
PR1, PR0
Main Timer Count Rates
0 0
1 count —
overflow —
1.0
s
65.536 ms
500 ns
32.768 ms
333 ns
21.845 ms
250 ns
16.384 ms
(1/E)
(216/E)
0 1
1 count —
overflow —
4.0
s
262.14 ms
2.0
s
131.07 ms
1.333
s
87.381 ms
1.0
s
65.536 ms
(4/E)
(218/E)
1 0
1 count —
overflow —
8.0
s
524.29 ms
4.0
s
262.14 ms
2.667
s
174.76 ms
2.0
s
131.07 ms
(8/E)
(219/E)
1 1
1 count —
overflow —
16.0
s
1.049 s
8.0
s
524.29 ms
5.333
s
349.52 ms
4.0
s
262.14 ms
(16/E)
(220/E)
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