NanoArc ACE RevA Configuration Register

Master baseline: NA-MASTER-001 RevA Freeze / Master Revision 1.2
Controller: Arduino Nano Every / ATmega4809
I2C: 0x20 panel input MCP23017
I2C: 0x21 panel output MCP23017
I2C: 0x22 machine I/O MCP23017
I2C: 0x3C 128x64 OLED
I2C: 0x50 MB85RC256V-class FRAM
SPI: D10-D13 external ADC
Panel: 4 rows x 5 columns; PRO retained; no PROG or ACK
Talkbacks: SAFE, CHARGE, READY, ARMED, OUTPUT, FAULT, ENERGY, OPR ERR

Project boundary: low-voltage control and logic-level verification only.
