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3.13 Reset-Generation (JP: 3, 4, 5, 7, 24, 35)

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.

JP3, JP5 As well the DTR-line as the RTS-Line of UART"A" or UART"B" can be used

to generate a system reset.

JP4

This jumper selects whether the DTR/RTS line from UART"A" or UART"B"

will generate a system reset.

JP7

This solder jumper selects between normal (immediate) reset and delayed reset.

In delayed reset mode, the reset button has to be held down for 2 sec before a

reset is generated to avoid accidental resets.

JP24

Open this jumper if no external Reset shall be generated.

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

JP35

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

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

Jumper

JP3 (DTR / RTS "A")

JP4 (UART"A"/"B")

JP5 (DTR / RTS "B")

JP7

(Reset imm./delayed)

JP24 (Main Reset)

JP35 (Polarity)

Default: JP24 is closed; JP3, JP4, JP5 and JP35 are open

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

disabled.

Note:

While a reset signal is asserted the red Reset-LED D14 is lit.

During normal operation, this LED should be off!

If JP35 (Polarity) is set, JP4 and either JP3 or JP5 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-960010-12

SK-96320-80PMC User Guide

Chapter 3 Jumpers and Switches

Setting

Description

1-2

DTR of UART"A" is selected

2-3

RTS of UART"A" is selected

1-2

UART"A" is used to generate Reset

2-3

UART"B" is used to generate Reset

1-2

DTR of UART"B" is selected

2-3

RTS of UART"B" is selected

1-2

Reset is applied immediately when SW6 is pressed

2-3

Reset is applied when SW6 is pressed >2sec

Closed

External Reset generation is active

Open

No external Reset generation

1-2

No negation for the DTR/RTS signal

2-3

DTR/RTS signal is negated

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