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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)： | 21/32頁 |
| 文件大?。?/td> | 219K |
| 代理商： | MPC555 |
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Application Note
Using the MPC555 as a Frequency Counter
AN1778
MOTOROLA
21
Configuring
MPC555
to Measure
Waveform Periods
The MDASM channel to be used needs to be configured to measure the
period of the signals. The number of counts that occurred during the
period of the test signal will be read out of the register. This will allow the
user to calculate the period of the waveform.
Setting Up
the MDASM
Bus C ounter
The MPC555 MIOS has a modulus counter submodule (MMCSM) which
can be used as a free-running counter to which events can be
referenced as they are detected. It can be used for complex counting
and timing functions.
The MDASM and the MMCSM work together to measure inputted
waveforms. For this example, the counter will be set to be free running
and to roll over automatically when it reaches its maximum value.
The counter is controlled by the MMCSM status/control register, shown
in
Figure 7
with its bit assignments.
Figure 7. MMCSM Status/Control Register (MMCSMSCR) 0x30 6036 and 0x30 60B6
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
PINC
RESET:
PINL
FREN EDGN EDGP
CLS
—
CP
—
—
0
0
0
0
0
0
U
U
U
U
U
U
U
U
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