參數(shù)資料
型號(hào): MC68HCP11A1CFN3
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, EEPROM, 3 MHz, MICROCONTROLLER, PQCC52
封裝: PLASTIC, LCC-52
文件頁數(shù): 79/158頁
文件大小: 776K
代理商: MC68HCP11A1CFN3
MC68HC11A8
TECHNICAL DATA
PROGRAMMABLE TIMER, RTI, AND PULSE ACCUMULATOR
MOTOROLA
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
0
0
1
1
PEDGE
0
1
0
1
Action on Clock
PAI Falling Edge Increments the Counter
PAI Rising Edge Increments the Counter
A zero on PAI Inhibits Counting
A one on PAI Inhibits Counting
Table 8-1 Real Time Interrupt Rate versus RTR1 and RTR0
XTAL =
12.0 MHz
8.192 ms
XTAL =
2
23
3.91 ms
XTAL =
8.0 MHz
4.10 ms
XTAL =
4.9152 MHz
6.67 ms
XTAL =
4.0 MHz
8.19 ms
XTAL =
3.6864 MHz
8.89 ms
RTR1
0
RTR0
0
Rate
2
13
÷
E
2
14
÷
E
2
15
÷
E
2
16
÷
E
E =
0
1
16.384 ms
7.81 ms
8.19 ms
13.33 ms
16.38 ms
17.78 ms
1
0
32.768 ms
15.62 ms
16.38 ms
26.67 ms
32.77 ms
35.56 ms
1
1
65.536 ms
31.25 ms
32.77 ms
53.33 ms
65.54 ms
71.11 ms
3.0 MHz
2.1 MHz
2.0 MHz
1.2288 MHz
1.0 MHz
921.6 kHz
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