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參數(shù)資料
| 型號： | 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)： | 12/32頁 |
| 文件大?。?/td> | 219K |
| 代理商： | MPC555 |
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Application Note
AN1778
12
MOTOROLA
Using the MPC555 as a Signal Generator
One of the MIOS features introduced in the
MIOS
entry here is the pulse
width modulator (PWM). The PWM can be used to generate waves of
varying frequencies and duty cycles. The first example in this application
note explains how to generate signals with frequencies of 5 MHz and
2.5 MHz, and an oscilloscope is used to look at the signals and measure
their frequencies.
Attaching the
Oscilloscope
Attaching two oscilloscope probes to the PWM channels might be the
hardest part of this exercise. The easiest way to get to the PWM
channels is through the MAPI ring connector on the underside of the
evaluation board (see
Figure 3
). Although the signals are present on the
board’s surface, high density Mictor connectors are needed that would
not be appropriate for this application.
On the underside of the evaluation board are five brown, 100-pin
Robinson Nugent connectors labelled J1/P1 through J4/P4. (The fifth
connector is an extension of the MAPI ring, MAPI 400 +100). The PWM
channels are on the J1/P1 connector. This example uses channels
PWM 0 and PWM 2 (to allow space between the contacts so that probe
tips can be attached without conflict). PWM 0 is on pin 30 and PWM 2 is
on pin 36 of J1/P1.
1.
Attach oscilloscope channel 1 to pin 30 of connector J1/P1.
2.
Attach oscilloscope channel 2 to pin 36 of connector J1/P1.
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