; T_EXT label Jump to label and execute as AVR assembly
; (return address in r24:r25)
;
+; T_SPI vx, y SPI transfer y bytes at [VX]
+; T_MFT vx, y Move value from countdown timer y
+; T_MTT vx, y Move value to countdown timer y
+; T_DIN vx, y Digital input from pin y, only modifies LSB of VX
+; T_DOUT vx, y Digital output to pin y, only reads LSB of VX
+; T_AIN vx, y Analog input from channel y
+; T_AOUT vx, y Analog output to PWM channel y
; ------------------------------------------------------------------------------