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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)： | 19/32頁 |
| 文件大?。?/td> | 219K |
| 代理商： | MPC555 |
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Application Note
Using the MPC555 as a Signal Generator
AN1778
MOTOROLA
19
Bits 8 through 15 of this register determine the clock divider to be used.
Table 4
describes the use of these four bits.
Now, generate a 5-MHz signal on channel 0 and a 2.5-MHz signal on
channel 2. If the intermodule bus is operating at 20 MHz and that is
divided by 2 to get a MIOS counter at 10 MHz, then set channel 0 to
divide the MIOS counter by 1, remembering that it takes two MIOS
counts per PWM period.
Likewise, to get 2.5 MHz on channel 2, divide the MIOS counter by 2.
Type this line for channel 0 (5 MHz):
write -w 0x306006 = 0x54ff
And this one for channel 2 (2.5 MHz):
write -w 0x306016 = 0x54fe
Other frequencies also can be produced using
Table 5
. Remember,
these values only apply for the simple 50 percent duty cycle waveforms
that have been created thus far with the MIOS counter at 10 MHz.
Table 4. MMCSMCR CP and MPWMSMSCR CP Values
Prescaler Value (CP in Hex)
MIOS Prescaler Clock Divided By:
FF
1
FE
2
FD
3
FC
4
FB
5
FA
6
F9
7
F8
8
......
........
02
254 (2^8 -2)
01
255 (2^8 -1)
00
256 (2^8)
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