Merge pull request #1286 from MCUdude/xplainedmini-suffer

Add `extra_features` to easily identify a programmers special abilities

src/avrdude.1

@@ -18,7 +18,7 @@
 .\"
 .\" $Id$
 .\"
-.Dd July 12, 2022
+.Dd January 15, 2023
 .Os
 .Dt AVRDUDE 1
 .Sh NAME
@@ -1141,6 +1141,36 @@ GPIO mode. High-voltage UPDI can be utilized by using an extended parameter:
 .It Ar hvupdi
 Enable high-voltage UPDI initialization for targets that supports this.
 .El
+.It Ar Xplained Mini (ISP and UPDI)
+.Bl -tag -offset indent -width indent
+.It Ar suffer=VALUE, suffer
+The SUFFER register allows the user to modify the behavior of the on-board mEDBG.
+The current state can be read by
+.Ar -xsuffer
+alone.
+.Bl -tag -offset indent -width indent
+.It Bit 7 ARDUINO:
+Adds control of extra LEDs when set to 0
+.It Bit 6..3:
+Reserved (must be set to 1)
+.It Bit 2 EOF:
+Agressive power-down, sleep after 5 seconds if no USB enumeration when set to 0
+.It Bit 1 LOWP:
+forc running the mEDBG at 1 MHz when bit set to 0
+.It Bit 0 FUSE:
+Fuses are safe-masked when bit sent to 1. Fuses are unprotected when set to 0
+.El
+.El
+.Pp
+.Bl -tag -offset indent -width indent
+.It Ar vtarg_switch=VALUE, vtarg_switch
+The on-board target voltage switch can be turned on or off by writing a 1 or
+a 0. The current state can be read by
+.Ar -xvtarg_switch
+alone.
+Note that the target power switch will always be on after a power cycle.
+Also note that the smaller Xplained Nano boards does not have a target power switch.
+.El
 .It Ar AVR910
 .Bl -tag -offset indent -width indent
 .It Ar devcode=VALUE