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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)： | 25/32頁 |
| 文件大小： | 219K |
| 代理商： | MPC555 |
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Application Note
Using the MPC555 as a Frequency Counter
AN1778
MOTOROLA
25
In programming the MDASM with register 0x30605E, notice that bit 0 in
Table 7
is a read-only status pin that toggles according to the status of
the incoming waveform.
For input period measurement:
Bits 1, 3, 5, 6, 7, 8, and 11 are not used. Write zeroes to these bits.
Because the MDASM should not freeze in BDM, bit 2 will be left
as 0.
Bit 4 will be 0 to trigger the MDASM counter on the rising edge.
Bits 9 and 10 select which 16-bit counter bus the MDASM will use.
Write 00 to these two bits.
To perform frequency measurement, the input period (MOD 0010 in
Table 8
) must be measured. Then convert this time measurement into
frequency to compare with what is being sent to the MDASM.
Table 8. MDASM Mode Selects
MDASM Control
Register Bits
MOD
0000
0001
0010
0011
0100
Bits
of
Resolution
Counter
Bus Bits
Ignored
MDASM Mode of Operation
—
16
16
16
16
—
—
—
—
—
DIS – Disabled
IPWM – Input pulse width measurement
IPM – Input period measurement
IC – Input capture
OCB – Output compare, flag on B compare
OCAB – Output compare,
flag on A and B compare
Reserved
Reserved
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
OPWM – Output pulse width modulation
0101
16
—
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
—
—
16
15
14
13
12
11
9
7
—
—
—
0
0,1
0-2
0-3
0-4
0-6
0-8
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