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參數(shù)資料
| 型號： | MC68HC05E0FN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 62/96頁 |
| 文件大?。?/td> | 890K |
| 代理商： | MC68HC05E0FN |
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7
MC68HC05E0
MOTOROLA
7-5
TIMERS
7.5
Real Time Interrupt Timer
The Real Time Interrupt circuit consists of a three stage divider and a 1 of 4 selector. The clock signal
which drives the RTI circuit is P02/214 (= P02/16384) with three additional divider stages giving a
maximum interrupt period of 32.8 milliseconds at a bus frequency of 4 MHz (See Figure 4-1).
The 8-bit RTI Timer Counter Register ($0019) is a read only register which contains the current
value of the 8-bit ripple counter at the beginning of the timer chain. Reset clears the counter.
During WAIT mode the CPU clock halts but the timer remains active. If the RTIE bit is set, a timer
interrupt will cause the processor to exit the WAIT mode. The timer is cleared when entering STOP
mode.
Figure 7-4 Real Time Interrupt Timer Structure
Divide
by 4
8-bit Freerunning
Counter
7-bit
Counter
RTI Select
RTIF
RTIE
RT1
RT0
IRQB
8
RTI Counter
Register ($0019)
RTI Control Register ($0018)
Bus Frequency P02
Data
Bus
65
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