36.21 UPDI Timing

UPDI Enable Sequence with UPDI PAD Enabled by Fuse(1)

Table 36-36. UPDI Timing Characteristics(1)
Symbol Description Min. Max. Unit
TRES Duration of Handshake/BREAK on RESET 10 200 µs
TUPDI Duration of UPDI.txd = 0 10 200 µs
TDeb0 Duration of Debugger.txd = 0 0.2 1 µs
TDebZ Duration of Debugger.txd = z 200 14000 µs
Note:
  1. These parameters are for design guidance only and are not covered by production test limits.
Table 36-37. UPDI Max. Bit Rates vs. VDD(1)
Symbol Description Condition Max Unit
fUPDI UPDI baud rate

VDD = [1.8, 5.5]V
TA = [0, 50]°C

 225 kbps

VDD = [2.2, 5.5]V
TA = [0, 50]°C

 450 kbps

VDD = [2.7, 5.5]V
TA = [0, 50]°C

 0.9 Mbps
Note:
  1. These parameters are for design guidance only and are not covered by production test limits.