RF-Star RF-BM-BG22A1, User Manual, Page: 7 / 23

RF-BM-BG22Ax
www.szrfstar.com V1.0 - Apr., 2021
Shenzhen RF-star Technology Co., Ltd.
Page 7 of 23
is busy, and the module will not send data to the MCU serial
port. When it is at a low level, the module will send data to the
MCU serial port.
7
PA04 PA04 I/O
The module output signal (Standard hardware flow control:
Require To Send). When it is in high low, the module serial
port is busy, and the MCU is not allowed to send data to the
module serial port. When it is at a low level, the MCU is
allowed to send data to the module serial port.
8
PA05 PA05 I/O Serial port TX
9 PA06 PA06 I/O
Serial port RX
10 GND GND -
Ground
11
RESET RESET - Reset pin, active low (internal pull-up)
12
PA01 PA01 I/O GPIO / SWCLK (connect JLink)
13
PA02 PA02 I/O GPIO / SWDIO (connect JLink)
14 GND GND -
Ground
15 VCC VCC VCC
Power supply: 1.71 V~ 3.8 V, recommended to 3.3 V
16
PD01 PD01 I/O
Slave role (including Beacon) connection status indicator: in
low level during connection (LED always on)
17
PD00 PD00 I/O
Master role connection status indicator: in low level during
connection (LED always on)
18
PC00 PC00 I/O GPIO
19
PC01 PC01 I/O GPIO
20 PC02 PC02 I/O
GPIO
21 PC03 PC03 I/O
GPIO
22 PC04 PC04 I/O GPIO
23
PC05 PC05 I/O GPIO
24
GND GND - Ground