Rs232 And Rs485; Table 8. Audio Related Jumpers; Table 9. Rs232 And Rs485 Related Jumpers - ST STM32G081B-EVAL User Manual

Hardware layout and configuration
Jumper
JP18
JP19
JP6
8.6.2
Jumper
JP14
JP10
22/78
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Table 8. Audio related jumpers

Speaker amplifier U17 is enabled when JP18 is closed (default setting)
Speaker amplifier U17 is disabled when JP18 is open
PA4 is connected to VIN1 of Audio amplifier when JP19 is closed (default setting)
PA4 is disconnected to VIN1 of Audio amplifier when JP19 is open
Mono playback is enabled when JP6 is set as shown on the right (default setting):
Stereo playback is enabled when JP6 is set as shown on the right:
Audio amplifier operates correctly when VDD > 2.2 V and microphone amplifier operates
correctly when VDD > 2.7 V.

RS232 and RS485

Communication through RS232 (with Hardware flow control CTS and RTS) and RS485 is
supported by D-type 9-pins RS232/RS485 connector CN11, which is connected to USART1
of STM32G081RBT6 on STM32G081B-EVAL Evaluation board. The signal
Bootloader_RESET (shared with CTS signal) and Bootloader_BOOT0 (shared with DSR
signal) are added on RS232 connector CN11 for ISP support.
By default, PC4 and PC5 are connected as TX and RX signals. PA9 and PA10 are also can
be connected as these two signals for bootloader which is NOT supported on PC4 and PC5
by setting of jumpers in Table

Table 9. RS232 and RS485 related jumpers

Description
RS232_RX is connected to RS232 transceiver and RS232 communication is enabled when
JP14 is set as shown on the right (default setting):
RS485_RX is connected to RS485 transceiver and RS485 communication is enabled when
JP14 is set as shown on the right:
PC4 is connected as TX signal without bootloader being supported when JP10 is set as shown
on the right (Default setting):
PA9 is connected as TX signal with bootloader being supported when JP10 is set as shown on
the right (CN1 motor control connector is needed to be open in this case):
Description
9.
UM2403 Rev 1
UM2403