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參數(shù)資料
| 型號(hào)： | MPC555 |
| 廠商： | Motorola, Inc. |
| 元件分類： | 32位微控制器 |
| 英文描述： | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| 中文描述： | 高度集成，低功耗，32位微控制器 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 219K |
| 代理商： | MPC555 |
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Application Note
AN1778
20
MOTOROLA
Using the MPC555 as a Frequency Counter
As part of its modular input/output subsystem (MIOS), the MPC555 has
a dual action submodule (MDASM). The MDASM can make pulse width
and period measurements. Also, it can be used to capture waveforms
and generate single and continuous pulses. We will use the MDASM to
measure the period of the two waveforms that were generated earlier
using the PWM.
Connecting PWM
Channels to
MDASM Channels
To measure the output of the PWMs with the MDASM, a signal must be
sent from the PWM channel (in this case channel 0 or channel 2) to the
MDASM channel 11. Here, the frequency of PWM channel 0 is
measured. The PWM channels are pins 30 and 36 on J1/P1 on the MAPI
connector. The MDASM channel is located on pin 21 of MAPI connector
J2/P2.
Using a jumper wire, connect J1/P1 pin 30 to J2/P2 pin 21. See
Figure 3
for MAPI pin locations.
NOTE:
It is a good idea to keep the oscilloscope connected to be sure that the
signal is getting to the MDASM.
Table 5. Sample Frequency Settings
Hex Bits
OF
FO
F8
FA
FB
FC
FD
FE
FF
Frequency
20 kHz
305 kHz
610 kHz
833 kHz
1 MHz
1.25 MHz
1.66 MHz
2.5 MHz
5 MHz
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