參數(shù)資料
型號(hào): MC68HC11ED0MFN2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁(yè)數(shù): 7/108頁(yè)
文件大?。?/td> 1672K
代理商: MC68HC11ED0MFN2
Technical Summary
MC68HC11ED0 — Rev. 1.0
Timing System
Timing System
Pulse accumulator control bits are also located within two timer
registers, TMSK2 and TFLG2, as described in 9.4.1 Pulse
9.4.1 Pulse Accumulator Control Register
DDRA7 — Data Direction for Port A Bit 7
PAEN — Pulse Accumulator System Enable Bit
0 = Pulse accumulator disabled
1 = Pulse accumulator enabled
PAMOD — Pulse Accumulator Mode Bit
0 = Event counter
1 = Gated time accumulation
Table 9-5. Pulse Accumulator Timing
Common XTAL Frequencies
4.0 MHz
8.0 MHz
12.0 MHz
CPU Clock
(E)
1.0 MHz
2.0 MHz
3.0 MHz
Cycle Time
(1
÷ E)
1000 ns
500 ns
333 ns
Pulse Accumulator (Gated Mode)
1 Count
(26
÷ E)
64.0
s
32.0
s
21.330
s
Overflow
214
÷ E)
16.384 ms
8.192 ms
5.491 ms
Address:
$0026
Bit 7
6
54321
Bit 0
Read:
DDRA7
PAEN
PAMOD
PEDGE
DDRA3
I4/O5
RTR1
RTR0
Write:
Reset:
00
000000
Figure 9-21. Pulse Accumulator Control Register (PACTL)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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