Fujitsu MB96300 series User Manual - Page 18

Browse online or download pdf User Manual for Motherboard Fujitsu MB96300 series. Fujitsu MB96300 series 36 pages. Mb96300 series

Print Page

3.6 Reset Generation (JP: 33, 41, 46, 47, 48)

In addition to the internal Power-On reset, the microcontroller can be reset by an external

reset circuit (Voltage Monitor) and also by a RS232 interface. Refer to the chapter 'LIN /

UART Connectors (X5 or X9)' for DTR / RTS selection.

JP33

Selects X5 or X9 as reset source.

JP41

The signal on the DTR/RTS line can be negated with this jumper.

Remove the jumper in order to disable the RS232 reset circuit.

JP46

Selects the mode of the reset button SW6.

JP47

A voltage supply monitor allows monitoring of 1V8 or 2V5 power supply.

JP48

Open this jumper if no external Reset shall be generated.

In this case only the internal reset is active (e.g.: power-on).

Jumper

JP33

(UART RESET)

JP41

(DTR / DTRx)

JP46

(Reset imm./delayed)

JP47

(Monitor 1V8 / 2V5)

JP48

(RST MCU)

By default, the external reset is enabled and set to immediate reset while the reset by UART

is disabled.

Note:

While a reset signal is asserted the red Reset-LED LD13 is lit.

During normal operation, this LED should be off!

If JP41 (DTR/DTRx) is set, the UART RESET jumper (JP33) and the according DTR/RTS

(JP23 and JP38) jumper have to be set, too.

If the reset LED is steadily on, check the power supply input voltage and the settings for the

reset-generation by UART.

FMEMCU-UG-960014-10

SK-96370-144PMC-GDC User Guide

Chapter 3 Jumpers and Switches

Setting

Description

1-2

X5 (UART0) is used to generate Reset

2-3

X9 (UART2) is used to generate Reset

1-2

No polarity inversion for the DTR/RTS signal

2-3

Polarity inversion for the DTR/RTS signal

1-2

Reset is applied immediately when SW6 is pressed

2-3

Reset is applied when SW6 is pressed > 2sec

1-2

The voltage supply monitor observes 1V8

2-3

The voltage supply monitor observes 2V5

Closed

External reset generation is active

Open

No external reset generation

Table 3-5: Reset Connection

- 18 -