It's been a while since I've tinkered with PIC's and I apologize if the questions below, about my most recent hobby project, are or seem obvious... then again I'm actually hoping that the answers I seek here are easy to provide
Anyway... I have a few questions about using the MikroETH 100 board and hooking it up to a PIC18F45K22.
Some background:
- I intend to use 3.3V power for everything within the Demo mikroETH 100 project provided on the product page download section for my learning/project.
- The example provided on the mikroETH 100 product page uses Development Board "LV18F v6" with the mcu being a "PIC18F87J60", I do not want to use these.
- The development board I'm using is a EasyPIC V7 and as stated, I wish to use a PIC18F45K22. I'm also using software, "mikroBASIC Pro for PIC v6.6.2".
- Upon the mikroETH 100 board, I'm keeping the jumpers in PSP MODE 5 (Table 1 from the pdf user manual) -
- Connections to PIC18F45K22, via jumpers 'CN1' and 'CN2': I need to connect 3.3V and GND (easy), then I believe I'd also only need to connect SCK, MISO, MOSI and CS# pins (on jumer 'CN2') for communication to the ENC624J600 chip on mikroETH 100 board. I'm not sure about INT or WRH pins (on jumper 'CN1') though. Somewhere I've seen I do not need these two pins (sorry I can't remember where I saw that though).
- I have quickly drawn on the image, showing these function pins as I see them upon the next table (Table 2 from the pdf user manual) -
So my questions (with reference to Table 2) are:
- A) Have I got it right; CS = CS#, RD = MISO, WR = MOSI ?
- B) What is the 'AL' (marked in blue pen in the image)? Specifically, what pin is this on either CN1 or CN2? What function is 'AL' ?
- C) Can I leave INT, CLK0 and WRH pins (found on 'CN1') unconnected, to make the demo project work? And can I leave pins 'AD0 to A15' (CN1) and pins 'A0 to A14' (CN2) unconnected as well?
- D) The CS#(CS) pin has a 1K pull-up resistor on the mikroETH 100 board.
I do not intent to use the 10K pull-up resistors upon the easyPIC v7 development board because of that 1K resistor. But, should (or do) I need to use a 10K pull-down resistor for MISO pin? Some areas (and I used to know this...sorry I have forgotten), say I do not need to use pull-up/down resistors when using SPI as a stand alone (a good idea to use pull-up/downs on these lines if also using I2C I read somewhere though). And would the MOSI pin be okay, not having a pull-up/down resistor connected?
As stated before, I intend to try out the demo for the mikroETH 100 board. I just want to use the PIC18F45K22 instead of the PIC18F87J60 used in the demo files. I will also use Port C on the PIC18F45K22 for Control lines:
CN1 - INT -> RC6 (Unknown if I need this pin)
CN2 - SCK -> RC3
CN2 - MISO -> RC4
CN2 - MOSI -> RC5
Again, (question 'B') what is 'AL' (Table 2 image) and where does it lay in either 'CN1' or 'CN2'.
I think I can work with the demo code, changing it to suit the PIC18F45K22. I have got other demo ethernet 'serial' and 'click boards', as well as Wifi boards, to work before. So figuring that side of things out I should be okay with. But I will post a question here as needed.
Thank you for any and all help.
Chris
