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4.3.7.3
UART1 Dual Interface
Bus Signals
Module
Pin No
9 UART1 CTS
10 UART1 RTS
11 UART1 TXD
12 UART1 RXD
27 DUAL STAT
28 DUAL SW
Specification of protocol and supported baud rates
The usage of the UART1 dual interface needs to be configured in the Customer Config of the
firmware. After booting, the MCU READY pin changes from low level to high level. As start
condition, the DUAL SW input pin needs to be pre-set from the HOST by changing from high
level to low level. The DUAL STAT output pin signals high level as Binary state. In this case, the
HOST is able to transmit or receive binary data.
To change from Binary to Command state, the DUAL SW input pin needs to be toggled (low -
high - low level change) from the HOST:
1. The change of state is initiated by changing the DUAL SW input pin from low to high
level (set toggle switch).
2. After the DUAL STAT pin has changed the state from high level to low level, the
Command state is active and the DUAL SW input pin can be reset from high level to low
level (reset toggle).
3. The HOST is now able to send commands. After the commands have been sent, it is
recommended to change back to Binary state by toggling the DUAL SW input pin again.
Product Specification Rev. 1.1
Signal Name
GPIO
Definition
OUT
IN
IN
OUT
OUT
IN
GPIO Level
State Default
Default
-
-
HIGH
Binary data
4.3.7.2 UART1 Binary Data Interface.
PAN9420 Wi-Fi Module
4 Specification
Description
Clear to send
Request to send
Transmit data output
Receive data input
UART1 state condition
(binary or command)
UART1 toggle switch
for binary/command
Page 26
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