參數(shù)資料
型號: MC68HC05X4CDWR2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 16/168頁
文件大?。?/td> 656K
代理商: MC68HC05X4CDWR2
16-Bit Programmable Timer
MC68HC05X4 Rev 1.0
112
16-Bit Programmable Timer
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 2s 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:
11111111
Figure 2. Timer Counter High Register (TCH)
Address:
$0019
Bit 7
654321
Bit 0
Reset:
11111100
Figure 3. Timer Counter Low Register (TCL)
4-ptimer
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