[oopic] Re: I/O lines of Oopic-C

Thank you, Richard
BR --Mika
--- In oopic@yahoogroups.com, "rtstofer" <rstofer@...> wrote:
>
> --- In oopic@yahoogroups.com, "mtiusanen" <mtiusanen@> wrote:
> >
> > Hi,
> > my question is about the iolines in Oopic-C:
> > Where is ioline 1 (and lines 2..7) in oopic-c?
> >
> > The meaning is to use analog input and convert the voltage to value
> > using aA2D8, but...
> > I haven't found the map of those lines in
> > http://www.oopic.com/oopiccn.htm
> > just lines 8..15 and 24..31 respectively. Where are the lines 1..7?
> > If they are the lines A1..A4 at the top of the chip, is the enumeration
> > A1 = I/O line 1, A2 = I/O line 2 etc?
> >
> > What are symbols "21", "T1", "P1" and "P2" standing for?
> >
> > THX /MT
> >
>
> Sometimes you need to bounce back and forth between the OOPic
> schematics and the 16F877A datasheet
> http://ww1.microchip.com/downloads/en/DeviceDoc/39582b.pdf

>
> It is also helpful to look at the R board schematic.
>
> Pins RA0 corresponds to A/D channel AN0, same for RA1-AN1, RA2-AN2,
> RA3-AN3, RA5-AN4, RE0-AN5, RE1-AN6 and RE2-AN7
>
> So, A0..A3 are potentially analog channels and are on the top of the
> package corresponding to AN0..AN3 inputs. Then things fall apart: RA5
> is used to talk to the EEPROM so AN4 is out the window. AN5..7 are
> connected to LEDs on the module so they can't be used without hacking
> the board.
>
> You have 4 analog inputs easily accessible.
>
>
>
> T1 - RC0 - IOLine 16
> P1 - RC1 - IOLine 17
> P2 - RC2 - IOLine 18
> 21 - RC5 - IOLine 21
>
> These 4 IOLines can be used as general purpose IO but they also have
> special functions.
>
> T1 is the external clock input for oTimer
> P1 is used with oPWM when the IOLine property is set to 1
> P2 is used with oPWM when the IOLine property is set to 0
> 21 is used with oFreq to output a high frequency square wave
>
> Because RA5 is used to drive the EEPROM, you can only have 7 A/D
> inputs even in the case of the S board (or just the 40 pin chip). Both
> the C module and R board have LEDs connected to the upper 3 A/D
> channels so they have just 4 A/D inputs without hacking.
>
> Richard
>

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