參數(shù)資料
型號: MC68HC11A1CP2
廠商: ABILIS SYSTEMS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝: PLASTIC, DIP-48
文件頁數(shù): 136/158頁
文件大小: 3803K
代理商: MC68HC11A1CP2
PROGRAMMABLE TIMER, RTI, AND PULSE ACCUMULATOR
MOTOROLA
TECHNICAL DATA
8-9
8
PAMOD — Pulse Accumulator Mode
0 = External event counting
1 = Gated time accumulation
PEDGE — Pulse Accumulator Edge Control
This bit has different meanings depending on the state of the PAMOD bit.
Bits 3-2 — Not Implemented
These bits always read zero.
RTR1 and RTR0 — RTI Interrupt Rate Selects
These two bits select one of four rates for the real time periodic interrupt circuit (see
Table 8-1). Reset clears these two bits and after reset, a full RTI period elapses before
the first RTI interrupt.
PAMOD
PEDGE
Action on Clock
0
PAI Falling Edge Increments the Counter
0
1
PAI Rising Edge Increments the Counter
1
0
A zero on PAI Inhibits Counting
1
A one on PAI Inhibits Counting
Table 8-1 Real Time Interrupt Rate versus RTR1 and RTR0
XTAL =
RTR1
RTR0
Rate
12.0 MHz
223
8.0 MHz
4.9152 MHz
4.0 MHz
3.6864 MHz
00
213 ÷ E
8.192 ms
3.91 ms
4.10 ms
6.67 ms
8.19 ms
8.89 ms
01
214 ÷ E
16.384 ms
7.81 ms
8.19 ms
13.33 ms
16.38 ms
17.78 ms
10
215 ÷ E
32.768 ms
15.62 ms
16.38 ms
26.67 ms
32.77 ms
35.56 ms
11
216 ÷ E
65.536 ms
31.25 ms
32.77 ms
53.33 ms
65.54 ms
71.11 ms
E =
3.0 MHz
2.1 MHz
2.0 MHz
1.2288 MHz
1.0 MHz
921.6 kHz
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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