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3
PAN1322-SPP Interfaces
3.1
UART Interface
The UART interface is the main communication interface between the host and PAN1322-SPP. AT commands
are desribed in detail in the AT Commands specification [1].
The interface consists of four UART signals and two LPM control signals as shown in
Host
WAKEUP_BT
WAKEUP_HOST
Figure 4
UART Interface
3.1.1
UART
The lines UARTTXD and UARTRXD are used for commands, responses and data. The lines UARTRTS and
UARTCTS are used for hardware flow control. A separate supply voltage, VDDUART, defines the UART reference
levels to fit any system requirements.
3.1.1.1
Baud Rates
The UART baud rate can be configured with the BD_DATA parameter UART_Baudrate. The module is
programmed for a default baudrate of 115200 baud. Reprogramming of the EEPROM configuration is possible by
AT commands at manufacturing time of the end product. The baudrate written to EEPROM will be used each time
PAN1322-SPP starts or, HW or SW reset is done.
The host is also able to change the baudrate temporarily with an AT command. This baudrate is used by
PAN1322-SPP until a HW or SW reset is done, when it will change back to the baudrate stored in the EEPROM.
The supported baud rates are listed in
clock generation.
Table 2
UART Baud Rates
Wanted Baud Rate
9600
19200
38400
57600
115200
230400
460800
921600
User's Manual
Hardware Description
UARTTXD
UARTRXD
UARTRTS
UARTCTS
Table 3
together with the small deviation error that results from the internal
Real Baud Rate
9615
19230
38461
57522
115044
230088
464285
928571
UARTTXD
UARTRXD
UARTRTS
UARTCTS
P0.14 input
P0.0 output
Deviation Error (%)
0.16
0.16
0.16
-0.14
-0.14
-0.14
0.76
0.76
16
PAN1322-SPP
ENW89841A3KF
PAN1322-SPP Interfaces
Figure
4.
PAN1322
Revision 1.3, 2013-08-14
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