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參數(shù)資料
型號(hào): MC68HC05X4DW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 112/156頁
文件大小: 926K
代理商: MC68HC05X4DW
16-Bit Programmable Timer
MC68HC05X4 Rev 1.0
112
16-Bit Programmable Timer
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Counter
The key element in the programmable timer is a 16-bit, free-running
counter, or counter register, preceded by a prescaler that divides the
internal processor clock by four. The prescaler gives the timer a
resolution of 2
μ
s if the internal bus clock is 2MHz. The counter is
incremented during the low portion of the internal bus clock. Software
can read the counter at any time without affecting its value.
Counter registers
Address:
$0018
Bit 15
14
13
12
11
10
9
Bit 8
Reset:
1
1
1
1
1
1
1
1
Figure 2. Timer Counter High Register (TCH)
Address:
$0019
Bit 7
6
5
4
3
2
1
Bit 0
Reset:
1
1
1
1
1
1
0
0
Figure 3. Timer Counter Low Register (TCL)
4-ptimer
F
Freescale Semiconductor, Inc.
n
.
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