Reference Manual

Table Of Contents
No µC Pin Designation I/O Description
1 ANT Input
RF connection to PCB antenna (see sec-
tion
4.2
)
2 RF Output
50 RF connection to external antenna or on-
board antenna via ANT (see section
4.2
)
3 GND Supply Ground
4 SWDCLK Input
Serial wire clock (SWD Interface). Uses internal
pull down resistor. Do not connect if not need-
ed.
5 SWDIO Input
Serial wire input/output (SWD Interface). Uses
internal pull up resistor. Do not connect if not
needed.
6 P0.18 /RESET Input
Reset pin. A low signal resets the module. Uses
internal pull up resistor.
7 P0.02 BOOT Input
Boot pin. A low signal during and short after re-
set starts the module in OTA bootloader mode.
Uses internal pull up resistor
1
. Do not connect
if not needed.
8 VDD Supply Supply voltage
9 P0.19 MODE_1 Input
Operation mode pin with internal pull down re-
sistor
1
during start-up. Low level or open: Nor-
mal Mode. High level: Peripheral only Mode.
Do not connect if not needed.
10 P0.22 BUSY Output
Indicates if module is busy with data transmis-
sion when using Peripheral only Mode (see sec-
tion
10.4.2
). Do not connect, if not needed.
11 P0.00/XL1
3
LED_1 Output
Indicates the module state (active high). Do not
connect if not needed.
12 P0.01/XL2
3
LED_2 Output
Indicates the module state (active high). Do not
connect if not needed.
13 P1.08 UTXD Output UART (Transmission)
14 P1.09 URXD Input
UART (Reception). Uses internal pull up resis-
tor
1
.
15 P0.11 /RTS Output
/RTS signal, if flow control is enabled. Static
low, otherwise. Do not connect if not needed.
Table 7: Pinout, first part
1
Internal pull ups or pull downs are configured at startup by the firmware installed in the SoC. The pull up on
the /RESET pin cannot be disabled by firmware.
2
NFC pins available for NFC function in custom firmware. The standard firmware of Proteus-III does not
implement this function.
3
Pins available to connect an external crystal in custom firmware. The standard firmware of Proteus-III does
not implement this function.
Proteus-III reference manual version 0.11 © November 2019
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