{"id":114,"date":"2014-02-09T22:48:54","date_gmt":"2014-02-09T13:48:54","guid":{"rendered":"http:\/\/otsuka.biz\/blog1\/?p=114"},"modified":"2024-02-12T13:45:01","modified_gmt":"2024-02-12T04:45:01","slug":"%e5%91%a8%e6%b3%a2%e6%95%b0%e3%82%ab%e3%82%a6%e3%83%b3%e3%82%bf%ef%bc%88ubw%e3%81%a7%e3%81%ae%e5%ae%9f%e9%a8%93%ef%bc%89","status":"publish","type":"post","link":"https:\/\/otsuka.biz\/blog1\/%e5%91%a8%e6%b3%a2%e6%95%b0%e3%82%ab%e3%82%a6%e3%83%b3%e3%82%bf%ef%bc%88ubw%e3%81%a7%e3%81%ae%e5%ae%9f%e9%a8%93%ef%bc%89\/","title":{"rendered":"\u5468\u6ce2\u6570\u30ab\u30a6\u30f3\u30bf Frequency counter with PIC18F2550 (UBW)"},"content":{"rendered":"

An experimental frequnecy counter with the UBW<\/p>\n

<< Introduction in Japanese >><\/p>\n

\u5468\u6ce2\u6570\u306e\u8a08\u6e2c\u306b\u306f\u3001\u57fa\u6e96\u6642\u9593\u5185\u3067\u4fe1\u53f7\u306e\u6ce2\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u65b9\u6cd5\u3068\u3001\u4fe1\u53f7\u306e\u5468\u671f\u3092\u8a08\u6e2c\u3057\u3066\u5468\u6ce2\u6570\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308b\u3002\u4eca\u56de\u306f\u524d\u8005\u306e\u65b9\u5f0f\u3067\u30010.1\u79d2\u9593\u306e\u6ce2\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u3002<\/p>\n

\u8a08\u6e2c\u4fe1\u53f7\u306f\u00a0PreAmp \u3067PIC \u306e\u898f\u683c\u306b\u9069\u5408\u3055\u305b\u3066 T0CKI (RA4) pin \u306b\u5165\u529b\u3057\u3066 Timer0 \u3067\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u3002<\/p>\n

\u57fa\u6e96\u6642\u9593\u306e\u751f\u6210\u306b\u306f\u3001\uff11\uff09\u30a2\u30bb\u30f3\u30d6\u30ea\u547d\u4ee4\u3067\u306e\u7dcf\u30ef\u30fc\u30c9\u6570\u304b\u3089\u9045\u5ef6\u95a2\u6570\u3092\u8a2d\u8a08\u3059\u308b\u65b9\u6cd5\uff08\u53c2\u7167\uff1a\u305f\u306e\u3057\u304f\u3067\u304d\u308b PIC \u96fb\u5b50\u5de5\u4f5c\uff0e\u6771\u4eac\u96fb\u6a5f\u5927\u5b66\u51fa\u7248\u5c40\uff09\u3001\uff12\uff09\u8aa4\u5dee\u3092\u8a8d\u3081\u3066\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u6a19\u6e96\u306e\u9045\u5ef6\u95a2\u6570\u3092\u7528\u3044\u308b\u65b9\u6cd5\u3001\uff13\uff09\u30bf\u30a4\u30de\uff11\u306e 16-bit overflow period \u3092\u8a08\u6e2c\u6642\u9593(gating-period)\u3068\u3059\u308b\u65b9\u6cd5\uff08CCP module \u672a\u5b9f\u88c5 PIC \u306e\u5834\u5408\uff09\u3001\uff14\uff09CCP module \u3092\u5229\u7528\u3059\u308b\u65b9\u6cd5\u3001\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u308b\u3002<\/p>\n

Original\u00a0UBW \u306f Fosc = 48 MHz \u3068\u9ad8\u901f\u3067\u3001Timer \u306b\u3088\u308b 0.1 \u79d2\u30b2\u30fc\u30c8\u6642\u9593\u306e\u751f\u6210\u304c\u56f0\u96e3\u3067\u3042\u308a\u3001\u30003)\u30014) \u306e\u65b9\u6cd5\u3092\u5b9f\u9a13\u3059\u308b\u70ba\u306b Fosc =\u00a020 MHz \u3078\u6e1b\u901f\u3057\u305f\uff08modifed UBW\uff09\u3002<\/p>\n

\uff08\u5e73\u621028\u5e747\u670818\u65e5\u88dc\u8db3\uff1a\u3000\u5b9f\u969b\u306e\u6e2c\u5b9a\u3067\u306f\u3001\u4fe1\u53f7\u3092\u9069\u5207\u306a\u30ec\u30d9\u30eb\u306b\u307e\u3067\u5897\u5e45\u3057\u3066\u5165\u529b\u3059\u308b\u9ad8\u5468\u6ce2\u5897\u5e45\u56de\u8def\u304c\u5fc5\u8981\u3067\u3001UBW \u306b\u306f\u30d7\u30ea\u30a2\u30f3\u30d7\u306f\u5b9f\u88c5\u3055\u308c\u3066\u3044\u306a\u3044\u3002\uff09<\/p>\n

In actual measurement, it is necessary to adapt a signal to the condition of TTL by a preamplifier.<\/p>\n

<<\u00a0Modified UBW >><\/p>\n

The configuration of\u00a0my modified\u00a0bootloader\u00a0is\u00a0set for 20MHz CPU clock derived from a 20MHz\u00a0ceramic resonator.<\/p>\n

CPU clock \u306e\u5909\u66f4\u306f\u3001MPLAB IDE (legacy IDE)\u00a0\u3067 UBW \u7528\u00a0bootloader \u306e hex file \u3092 import \u3057\u3001configuration bits \u3092\u5909\u66f4\u3057\u3066 PICKit3 \u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u305f\u3002<\/p>\n

Select Divice\u00a0: PIC18F2550
\nConfiguration Bits set in code \u306e\u30c1\u30a7\u30c3\u30af\u3092\u5916\u3057\u3066\u3001
\nFOSC : HS oscillator (HS)
\nPLLDIV : Divide by 5 (20 MHz oscillator input)
\nUSBDIV : USB clock source comes from the 96 MHz PLL divided by 2
\nCPUDIV :\u00a0\u00a0[Primary Oscillator Scr: \/1] [96 MHz PLL Scr: \/2]
\n\u4e0a\u8a18\u306e\u8a2d\u5b9a\u3067 PIC18F2550 \u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u305f\u3002<\/p>\n

<<\u00a0UBW\u00a0board\u00a0>><\/p>\n

The\u00a0test board is the\u00a0same\u00a0one\u00a0of my page on Jan. 16, 2014.<\/p>\n

Bootloader ( RC0 – LED, RC1 – LED, RC2 – switch2 (pull down), MCLR – switch1 (pull down) )<\/p>\n

LCD\u00a0:\u00a0SC1602BBWB-XA-GB-G ( RS – RB2, R\/W – GND, E – RB3, Data bus – RB4\uff5eRB7 )<\/p>\n

<<\u00a0Sample code >><\/p>\n

My files do not include a bootloader\u00a0nor a USB driver.<\/p>\n

To diminish error in measurement, you must improve\u00a0my code and use a crystal unit.<\/p>\n

2)\u00a0 A project using a function of XC8, __delay_ms() to operate an event counter of timer0, in a condition of 48MHz CPU clock derived from 20MHz ceramic resonator using PLL circuit (with the original UBW of my page on Jan. 16, 2014)

\n\n
\n
\n
\n
\"\u30a2\u30a4\u30b3\u30f3\"<\/div>\n
\n

UBW counter2<\/a><\/h3>\n
<\/i> 1 \u30d5\u30a1\u30a4\u30eb <\/i> 12.76 KB<\/div>\n <\/div>\n
\n \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<\/div><\/p>\n

3)\u00a0 A project using a timer1 overflow interrupt of a Fosc-20MHz input in order to control an event counter of timer0 (with my modified UBW)

\n\n
\n
\n
\n
\"\u30a2\u30a4\u30b3\u30f3\"<\/div>\n
\n

UBW counter3<\/a><\/h3>\n
<\/i> 1 \u30d5\u30a1\u30a4\u30eb <\/i> 13.19 KB<\/div>\n <\/div>\n
\n \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<\/div><\/p>\n

4) \u00a0A project using a CCP and Timer1 compare mode of a Fosc-20MHz input in order to control an event counter of timer0 (with my modified UBW)

\n\n
\n
\n
\n
\"\u30a2\u30a4\u30b3\u30f3\"<\/div>\n
\n

UBW counter4<\/a><\/h3>\n
<\/i> 1 \u30d5\u30a1\u30a4\u30eb <\/i> 13.25 KB<\/div>\n <\/div>\n
\n \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<\/div><\/p>\n

<<\u00a0A bootloader set >><\/p>\n

\n\n
\n
\n
\n
\"\u30a2\u30a4\u30b3\u30f3\"<\/div>\n
\n

UBW bootloader<\/a><\/h3>\n
<\/i> 1 \u30d5\u30a1\u30a4\u30eb <\/i> 156.81 KB<\/div>\n <\/div>\n
\n \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"

An experimental frequnecy counter with the UBW << Introduction in Japanese >> \u5468\u6ce2\u6570\u306e\u8a08\u6e2c\u306b\u306f\u3001\u57fa\u6e96\u6642\u9593\u5185\u3067\u4fe1\u53f7\u306e\u6ce2\u6570 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"vkexunit_cta_each_option":"","footnotes":""},"categories":[2,5],"tags":[],"class_list":["post-114","post","type-post","status-publish","format-standard","hentry","category-pic","category-radio-frequency"],"_links":{"self":[{"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/posts\/114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/comments?post=114"}],"version-history":[{"count":1,"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/posts\/114\/revisions"}],"predecessor-version":[{"id":3328,"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/posts\/114\/revisions\/3328"}],"wp:attachment":[{"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/media?parent=114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/categories?post=114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/otsuka.biz\/blog1\/wp-json\/wp\/v2\/tags?post=114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}