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發表於 2020-9-23 09:46:31
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MCU的規格表如下, 注意底下文字 "ERC mode是2 [MHz]",
(表示那顆外掛晶振是2 [MHz]),
可以試試換晶振 (但我比較認為是MCU裡的程式碼亂了,
如果是, 那只能送東元原廠了)
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General Description
The EM78P372N is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS
technology. The device has an on-chip 2K×13-bit Electrical One Time Programmable Read Only Memory
(OTP-ROM). It provides a protection bit to prevent intrusion of user’s OTP memory code. Three Code option bits
are also available to meet user’s requirements.
With enhanced OTP-ROM features, the EM78P372N provides a convenient way of developing and verifying user’s
programs. Moreover, this OTP device offers the advantages of easy and effective program updates, using
development and programming tools. User can avail of the ELAN Writer to easily program his development code.
2 Features
CPU configuration
• 2K×13 bits on-chip ROM
• 80×8 bits on-chip registers (SRAM)
Operating frequency range (base on 2 clocks):
• Crystal mode: DC ~ 16 MHz, 4.5V;
DC ~ 8 MHz, 3V; DC ~ 4 MHz, 2.1V
• ERC mode: DC ~ 2 MHz, 2.1V;
• IRC mode
(4.5 ms : 18 ms)
• Power saving Sleep mode
• Power-on voltage detector available (1.9V ± 0.2V)
• High EFT immunity (better performance at 4 MHz or
below)
補充內容 (2020-9-23 11:58 PM):
sorry, 早上一忙看錯,
Crystal mode才是晶振規格,
*************
Crystal mode: DC ~ 16 MHz, 4.5V;
DC ~ 8 MHz, 3V; DC ~ 4 MHz, 2.1V.
*************
依據操作電壓, 選用不同晶振頻率,
(越低壓操作, MCU速度慢, 所以晶振頻率需越低),
至於ERC mode和 IRC mode,
ERC: external RC, 外掛電阻和電容, 所構成的震盪電路,
IRC: internal RC, 內建電阻和電容, 所構成的震盪電路,
前面幾樓還有人提供LED可能故障的文章,
如真如此, 那這電扇就有機會完修,
板凳搬來, 繼續看下去 |
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