ST STM8A-DISCOVERY, User Manual, Page: 20 / 48

Hardware and layout UM1574
20/48 Doc ID 023645 Rev 1
4.2.4 STM8AF board solder bridges
Table 2. STM8AF board solder bridges
Bridge State
(1)
Description
SB1 (Reserved) ON Reserved, do not modify.
SB2
(STM_RST)
OFF NRST signal of STM32F103C8T6 (ST-LINK/V2) is not connected to GND.
ON NRST signal of STM32F103C8T6 (ST-LINK/V2) is connected to GND.
SB3 (MCO)
OFF
MCO clock from STM32F103C8T6 is not connected to PA1 (OSC_IN) of
STM8AF5288T.
ON MCO clock from STM32F103C8T6 is connected to PA1 (OSC_IN) of STM8AF5288T.
SB4,5
(Reserved)
OFF Reserved, do not modify.
SB6
(L99PM62GXP
Reset)
OFF
NRESET of L99PM62GXP is not connected to the STM8AF5288T Reset pin (external
watchdog disable).
ON
NRESET of L99PM62GXP is connected to the STM8AF5288T Reset pin (external
watchdog enable).
SB7
(CAN supply)
ON CAN transceiver is powered ON.
OFF CAN transceiver is OFF. This selection saves power consumption.
SB8
(Start-up delay)
OFF
If the STM8AF board is connected to another STM8AF board, then one of them must
have SB8 OFF.
ON The STM8AF board is connected to the STM8AL board (standard demo package).
SB9 (CAN
terminating
resistor)
ON The CAN terminating 120 Ohms resistor is connected on the CAN bus.
OFF The CAN terminating 120 Ohms resistor is not connected on the CAN bus.
SB10,11
(USB5V)
ON
USB5V is available on CN3/CN4 connectors for powering an external board through
CN3/CN4.
OFF USB5V is not available on CN3/CN4 connectors.
SB12,13
(Reserved)
ON Reserved, do not modify.
1. Default SBx state is shown in bold.