User's Manual

HF-A21 Embedded WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
7
9
Indicate the module
status of power on
process
nReady
O
“0” or “Palmodic Signal” - Finish
module boot up process;
“1” - Module boot up not finish.
Can be configured as GPIO.
GPIO
GPIO35
I/O
10
Restore configuration
nReload
I
Module will Restore factory
default configuration after set this
pin “0” more than 3s, then set
“1”.
GPIO
GPIO34
I/O
11
Ethernet Interface
PHY_RX+
I
Ethernet Data Interface, current
driver mode.
12
Ethernet Interface
PHY_RX-
I
13
Ethernet Interface
PHY_TX+
O
14
Ethernet Interface
PHY_TX-
O
Note1: These Pins should not add external pull-up resistor. It's configure pin for module
bootup. There is pull-down resistor for UART_TXD. This pin must keep low when bootup.
Note2: UART_RXD has a 4.7K pulldown resistor.