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參數(shù)資料
| 型號(hào)： | MC68HC08AS20CFN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁(yè)數(shù)： | 58/96頁(yè) |
| 文件大?。?/td> | 3243K |
| 代理商： | MC68HC08AS20CFN |
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7
MC68HC05E0
MOTOROLA
7-1
TIMERS
7
TIMERS
The MC68HC05E0 contains three timers: Timer A, Timer B and the Real Time Interrupt Timer.
Timers A and B are driven by the sub-system clock, which also drives the Serial Interface
sub-system. The Real Time Interrupt timer is driven from the bus clock (P02).
Timer A and Timer B can generate an independent interrupt signal to the processor. Timer A has
a higher interrupt priority than timer B. The Real Time Interrupt shares its interrupt vector with the
External Interrupt (INTX) and the Port C Wake-up function.
7.1
Sub-system Clock Control
The sub-system clock frequency fsub is generated from the bus clock frequency (P02) by a
selectable prescaler (see Figure 7-1).
Figure 7-1 Sub-system Clock Generation
Bus Clock
Frequency
P02
Sub-system
Clock
Frequency
÷2
MUX
Timer A
Timer B
SI
00
01
10
11
RTI Timer
TS (Timer Stop Gate Input Pin)
÷2
SC1
SC0
CETB CETA
Timer Control Register ($000C)
f sub
61
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