Willem ISP Header to Arduino SPI     2019/07/15-16
by Ami Sapphire

Last Updated: 2019/12/31

2019
[0717] Changed CLK wire from Orange to Brown
       Marked ICSP pin 1 as optional
       Added Willem ISP and ICSP pinouts

[1231] Added Willem 25Xxxx pinout and table to document
       Changed title for publication use
       General Cleanup



The Arduino, when connected to USB, can provide +5V so pin 2 on Arduino is not
technically needed. But, Pin 1 on the Willem Programmer's ICSP (or Pin 8 on the
25Xxxx socket), VPP, can provide +5V if not using the Arduino's USB header for
any purpose.



For Willem units that contain an ISP header:

┌────────────────────────────┬───────────────────┬─────────────┐
│ WILLEM PROGRAMMER          │ ARDUINO           │ Wire Colors │
├────────┬─────────────┬─────┼─────────────┬─────┼─────────────┤
│ Header │ Designation │ Pin │ Designation │ Pin │ Assignments │
├────────┼─────────────┼─────┼─────────────┼─────┼─────────────┤
│ ISP    │ CS          │  1  │ RESET       │  5  │ Yellow      │
│ ISP    │ SO          │  2  │ MOSI        │  1  │ White       │
│ ISP    │ CLK         │  3  │ SCK         │  3  │ Brown       │
│ ISP    │ SI          │  4  │ MISO        │  4  │ Green       │
│ ISP    │ GND         │  5  │ GND         │  6  │ Black       │
│ ICSP * │ VPP         │  1  │ +5V         │  2  │ Red         │
└────────┴─────────────┴─────┴─────────────┴─────┴─────────────┘
* = optional


For all other Willem units without the ISP header (you will require a cabled
adapter):

┌────────────────────────────────┬───────────────────┬─────────────┐
│ WILLEM PROGRAMMER              │ ARDUINO           │ Wire Colors │
├────────────┬─────────────┬─────┼─────────────┬─────┼─────────────┤
│   Socket   │ Designation │ Pin │ Designation │ Pin │ Assignments │
├────────────┼─────────────┼─────┼─────────────┼─────┼─────────────┤
│  25Xxxx    │ CS          │  1  │ RESET       │  5  │ Yellow      │
│  25Xxxx    │ SO          │  2  │ MOSI        │  1  │ White       │
│  25Xxxx    │ GND         │  4  │ GND         │  6  │ Black       │
│  25Xxxx    │ SI          │  5  │ MISO        │  4  │ Green       │
│  25Xxxx    │ CLK         │  6  │ SCK         │  3  │ Brown       │
│  25Xxxx *  │ VPP         │  8  │ +5V         │  2  │ Red         │
└────────────┴─────────────┴─────┴─────────────┴─────┴─────────────┘
* = optional



Willem Programmer Pinouts

This applies to all Willem Programmer versions from PCB3b to PCB5 releases, and
even cloned units such as PCB5.5 and PCB6 (basically PCB5 with modifications
and updates).


25Xxxx Pinout

1 = CS
2 = SO
4 = GND
5 = SI
6 = CLK
8 = VPP


ISP Pinout (Willem units with ISP header only!)

1 = CS
2 = SO
3 = CLK
4 = SI
5 = GND


ICSP Pinout

1 = VPP
2 = VCC
3 = GND
4 = DATA
5 = CLK