Fujitsu 16LX manual 803SO\5IRUWKHZKROH%7721ERDUG6$16,7&+6

8￿￿03(SO\5IRU￿WKHZKROH%7721ERDUG6$1'6:,7&+(6

When6XSSO\SHO6XSSO\T,&38the +5V from the voltage regulator is connected to board VCC. This jumper must be removed when using an external +5V power supply to avoid current flowing backIRUto the regulator.

When SHORT, the VCC is connected to CPU’s VCC pins. Before removing this jumper, remove the J3 (AVCC to CPU) jumper as well to completely disconnect the power from

the CPU. IRU&38

When SHORT,*URXQGboard’s VCC is connected to CPU’s AVcc pin.

When SHORT, board’s GND is connected￿￿IRU&38to CPU’s AGND pin.

When SHORT, board’s VCC is connected to CPU’s AVR+ pin. When removed, the voltage$QDORJat the5HIHUHQFH9ROWDJHAVR+ pin is set to￿4VIRU

When SHORT, board’s GND is connected to CPU’s AVR- pin. When removed, the -voltage￿￿-￿￿-at￿￿the8$AVR57￿￿￿- pinVHOHFWLRQIRUis set to 0.9VWKH. .￿FRQQHFWRU

These jumpers select, which of the two UART0, UART1 interfaces signals will be connected to the pins of the K7 connector. If all of these jumpers are in

1-2 position - the UART1 interface signals will be connected to the K7

2-3 position – the UART0 interface signals will be connected to the K7 connector.

Default setting: the UART1 signals are connected to the K7.

Note: The J7 jumper selects between SCK1 and SCK0, J8 between SIN1 and SIN0 and J9 between SOT1 and SOT0

Warning: if you want to use the K7 connector when Mainboard is connected to the CPU board, you have to disconnect the selected serial interface (UART0 or UART1) from the RS232 drivers on the Mainboard. To achieve this, remove jumpers on positions 3-4, 5-6 from both the J21 and J22 headers on the Mainboard. Also, when the Mainboard is connected to the CPU board and the Async. Serial programming mode is set on the Mainboard System control DIP switches, the FPGA UART is connected to UART0 or UART1 (depending on the setting of the UART0/1 switch) after reset. If you want to use K7 also in that case, remove the 3-4, 5-6 jumpers on the J23.