From: Harold Hallikainen <harold@mai.hallikainen.org>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Wed, 22 Jul 2020 09:52:40 -0700
Subject: Re: [PIC]: 18F47K42
Thread-Topic: [PIC]: 18F47K42
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Also, as I recall, some the BRGH bit did not work on some chips. That may
have been fixed in later revisions. As always, it's good to look at the
errata!

Harold

>  I had a similar problem - different PIC, different compiler.=C2=A0 On th=
at I
> looked in the part errataPIC18(L)F27/47/57K42 Family Silicon Errata and
> Data Sheet Clarification
> Document DS80000773C-page 6=C2=A0for yours it says
> 4. Module: Universal AsynchronousReceiver Transmitter (UART)=C2=A0
> 4.1 Baud Rate Generator Speed SelectThe Baud Rate Generator Speed Select
> feature(BRGS bit in the UxCON0 register) in DALImode is not functional.
> The Baud RateGenerator always operates at normal speedwith 16 baud clocks
> per bit in DALI mode.=C2=A0
> Work aroundNone.=C2=A0
> Affected Silicon Revisions=C2=A0 =C2=A0.... this may be the problem ?????=
???
> 4.2 Stop Bit Interrupt Flag=C2=A0
> Stop Bit interrupt flag functionality is notavailable in the CERIF bit in
> revision A1.=C2=A0Work aroundUse Timer2 with HLT and connect the UART RXp=
ort
> to the timer Reset trigger. Set the time-outperiod to the desired Stop bi=
t
> time (for DALImode, this is equivalent to two Stop bits at 1200baud =3D 1=
..66
> ms). When the Stop bit is received,the timer times out notifying end of
> data.Affected Silicon Revisions=C2=A0
> 4.3 Auto-BaudWhen the UART is configured as follows,=C2=A0
>
>
> Roger
>
>     On Tuesday, July 21, 2020, 08:39:08 PM PDT, Harold Hallikainen
> <harold@mai.hallikainen.org> wrote:
>
>  If SOMETHING happens when you send a character to the UAST, I suspect
> it's
> working, but the bit rate or bits per character is wrong (especially the
> bit rate). Also, some chips allow you to invert the transmit data which
> will also, of course, mess things up. Can you look at the pin on a logic
> analyzer or scope? That way you can see what's going on.
>
> Good luck!
>
> Harold
>
>
>>
>>=C2=A0 All,
>>
>>=C2=A0 I am trying to get the EUSART1 on a
>>=C2=A0 PIC18F47K42 in a 40 pin dip package
>>=C2=A0 to operate.
>>
>>=C2=A0 This part has the Peripheral Pin Select.
>>=C2=A0 functionality that allows you to remap
>>=C2=A0 some peripheral input and outputs to more
>>=C2=A0 convenient package pins for easier pcb
>>=C2=A0 routing.
>>
>>=C2=A0 I have chosen to make USART1 input on
>>=C2=A0 Pin C7 and output on pin C6.
>>
>>=C2=A0 I am using Mikro C for PIC and have used the.
>>=C2=A0 USART library to do the USART setup, and am
>>=C2=A0 using the EasyPIC 7 dev board for programming
>>=C2=A0 and code development.
>>
>>=C2=A0 I have set the baud rate to 19200, set USART1
>>=C2=A0 to be active, enabled the USART, transmit and
>>=C2=A0 receive on, etc.
>>
>>=C2=A0 I either get nothing from the USART or
>>=C2=A0 gibberish.
>>
>>=C2=A0 I have been through the code a dozen times
>>=C2=A0 have tried various combinations of options
>>=C2=A0 etc.
>>
>>=C2=A0 Does anyone have any experience or ideas
>>=C2=A0 about why might this be happening?
>>=C2=A0 Or suggestions of what to try?
>>
>>=C2=A0 Using Microchip C or MAPLB X with the Code
>>=C2=A0 Configurator Ap is not possible.
>>
>>=C2=A0 I want to be able to use this processor
>>=C2=A0 without having to rely on Mplab X with code
>>=C2=A0 configurator.
>>
>>=C2=A0 Any insight or suggestions would be greatly
>>=C2=A0 appreciated.
>>
>>=C2=A0 Thanks and Regards,
>>
>> Jim
>>
>>
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>>
>
>
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>


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