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21
Pinout and Packaging
“No connect” pins
General-purpose I/O
Pin Description
R13 Tie to V
CC
P12 Tie to V
CC
N12 XTALB1: Tie to V
CC
R15 XTALB2: NO CONNECT
M11 NO CONNECT
P11 NO CONNECT
N11 NO CONNECT
R12 NO CONNECT
R14 NO CONNECT
P13 NO CONNECT
Table 8: “No connect” pins
GPIO
signal
Serial
signal
Other
signal
Pin I/O OD
Serial channel
description
Other
description
PORTA7 TXDA J14 U I/O 2 Channel 1 TXD
PORTA6 DTRA_ DREQ1_ J13 U I/O 2 Channel 1
DTR_
DMA channel
3/5 Req
PORTA5 RTSA_ J15 U I/O 2 Channel 1
RTS_
PORTA4 RXCA/
RIA_/
OUT1A_
J12 U I/O 2 Pgm’able Out/
Channel 1
RXCLK/
Channel 1 ring
signal/Channel
1 SPI clock
(CLK)
Table 9: GPIO pinout