参数资料
型号: MC68HC11F1CFN4
厂商: Freescale Semiconductor
文件页数: 12/158页
文件大小: 0K
描述: IC MCU 512 EEPROM 4MHZ 68-PLCC
标准包装: 18
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 4MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 30
程序存储器类型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.75 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 68-LCC(J 形引线)
包装: 管件
TIMING SYSTEM
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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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