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參數(shù)資料
| 型號： | MC68HC05E0 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 4 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 60/96頁 |
| 文件大小： | 970K |
| 代理商： | MC68HC05E0 |
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7
MC68HC05E0
MOTOROLA
7-3
TIMERS
The Timer A Prescaler register ($000A) is an 8-bit wide data register which is used for setting the
prescaler. It is a read/write register and can be loaded with any value between $00 and $FF.
Writing N to this register causes the prescaler to divide by N+1. Writing to this register resets the
entire timer.
With the bus clock running at 4 MHz, Timer A has a range of 16
s to 32.8 ms.
7.3
Timer B
Timer B consists of a 14-bit free-running counter driving an 8-bit scaler (see Figure 7-3).
The Timer B Scaler Register ($000B) is an 8-bit wide data register which is used for setting the
scaler. It is a read/write register and can be loaded with any value between $00 and $FF. Writing
N to this register causes the scaler to divide by N+1. Writing to this register resets the entire timer.
With the bus clock running at 4 MHz, this timer has a range of 32.8 ms to 8.4 s.
Figure 7-3 Timer B Structure
CETB
14 Bit
8 Bit
Timer B
Scaler Register
INTMB
INTFB
INT1
(32 ms - 8 s)
Sub-system
Clock
Frequency
OF
(freerunning)
$000B
63
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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