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

--- 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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