参数资料
型号: MC68HC11D0CFBE3
厂商: Freescale Semiconductor
文件页数: 113/124页
文件大小: 0K
描述: IC MCU 8BIT 3MHZ 44-QFP
标准包装: 480
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 3MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 26
程序存储器类型: ROMless
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-QFP
包装: 托盘
TIMING SYSTEM
TECHNICAL DATA
9-3
9.1 Timer Structure
Figure 9-1 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 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 level on
PA[2:0] can be read at any time (read PORTA register), even if the pin is being used
for the input capture function. Pins PA[6:4] are used for either general-purpose output,
or as output compare pins. Pin PA3 can be used for general-purpose I/O, input capture
4, output compare 5, or output compare 1. 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 (OC5–OC2) 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
Other Rates
Control
1.0 MHz
2.0 MHz
3.0 MHz
(E)
Bits
1000 ns
500 ns
333 ns
(1/E)
PR[1:0]
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
(E/1)
(E/216)
0 1
1 count —
overflow —
4.0 s
262.14 ms
2.0 s
131.07 ms
1.333 s
87.381 ms
(E/4)
(E/218)
1 0
1 count —
overflow —
8.0 s
524.29 ms
4.0 s
262.14 ms
2.667 s
174.76 ms
(E/8)
(E/219)
1 1
1 count —
overflow —
16.0 s
1.049 s
8.0 s
524.29 ms
5.333 s
349.52 ms
(E/16)
(E/220)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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