Bom, de qualquer forma, segue o projeto do contador de pulsos de 4 dígitos, que pode ser útil a alguém.
Vídeo do protótipo em protoboard:
https://youtu.be/D9lxaMOkJNoCódigo Hex pra gravar no PIC 16F628:
:100000005428A101E83EA000A109FC30031C0B28E4
:10001000A00703180828A0076400A10F08282018CB
:100020001128A01C1528000015280800013EA70073
:100030000A30A200A3013320A70B1B2824080800C4
:10004000A20004302328A80023082102031D2A2827
:100050002208200204300318013003190230280559
:10006000031DFF304F28A501A4011030A600210D6B
:10007000A40DA50D2208A4022308031C230FA5022A
:10008000031849282208A40723080318230FA507EB
:100090000310A00DA10DA60B372820084F288313AD
:1000A000031383126400080007309F008316E830B2
:1000B000810083128B018316303085008601831204
:1000C0003F308500FF308600BA01BB01C5018101C8
:1000D000C40185103C0886000130A100F4300220E4
:1000E000851405103D0886000130A100F43002207F
:1000F000051485113E0886000130A100F43002206D
:10010000851505113F0886000130A100F43002205A
:10011000051564004408010203198F2890206928FE
:100120006400010844020318A12844080102B80031
:10013000B901031CB9033808BA0739080318013E8E
:10014000BB076400440801020318BA284408FF3CB6
:10015000B8000030031CFF3EB9000108B8070318BF
:10016000B90AB80A0319B90A3808BA0739080318CE
:10017000013EBB070108C4003A08A0003B08A100EB
:100180002730A30010302020031DC828BA01BB016E
:100190003A08A0003B08A10000301620C0003A0831
:1001A000A0003B08A10001301620C1003A08A000C1
:1001B0003B08A10002301620C2003A08A0003B080C
:1001C000A10003301620C3004008093C031CFC2892
:1001D000EB20BC00FC2800308A004008F23E0318E7
:1001E0008A0A820001346D34223428344C341834A5
:1001F00010342D34003408344108093C031C142900
:100200000321BD00142901308A0041080A3E031869
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:1002200010342D34003408344208093C031C2C29B6
:100230001B21BE002C2901308A004208223E0318EF
:100240008A0A820001346D34223428344C34183444
:1002500010342D34003408344308093C031C44296D
:100260003321BF00442901308A0043083A3E031875
:100270008A0A820001346D34223428344C34183414
:0E02800010342D340034083408006300452982
:02400E00303F41
:00000001FF