Fujitsu MB91470 SERIES Benutzerhandbuch - Seite 14

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4.5 UART2 (JP: 17, 18, 19)

One RS232-transceiver (U3, X6) can be connected to the microcontrollers UART interface 2.

JP17, JP18

connect UART 2 to the RS232 transceiver (U4, X7)

JP19

Some programs (e.g. Terminals) need a connection between CTS and RTS

Jumper

JP17 (SIN2)

JP18 (SOT2)

JP19 (RTS-CTS)

By default, UART2 (SIN2/SOT2) is connected to X7.

4.6 Reset-Generation (JP: 9, 23, 25, 30)

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.

JP9

This jumper selects whether the DTR line from UART0 or UART1

will generate a system reset.

JP23

This jumper connects the MCU Pin 17 (Base timer output TOUT3) to the external

watchdog IC's trigger input

JP25

Open this jumper if no external Reset shall be generated, e.g. to avoid accidental

reset during long-term testing or demonstration.

JP30

This jumper enables the watchdog function of the reset IC U5. If this is closed, U5

U5 issues a reset if it is not periodically re-triggered by the MCU (PJ7/TOUT3)

Jumper

JP9

JP23 (WD_TOUT3)

JP25 (Ext. Reset)

JP30

(Watchdog)

FMEMCU-UG-910067-10

SK-91470-144PMC1-MC User Guide

Chapter 4 Jumpers and Switches

Setting

Description

SIN2 of MCU is connected to UART2

Closed

SIN2 not connected to UART2

Open

SOT2 of MCU is connected to UART2

Closed

SOT2 not connected to UART2

Open

Closed

RTS and CTS of X7 are connected

Open

RTS and CTS of X7 are not connected

Setting

Description

1 - 2

DTR of UART0 is selected for reset generation

2 - 3

DTR of UART1 is selected for reset generation

Closed

MCU Pin 17 (PJ7/TOUT3) connected to U5

Open

MCU Pin 17 (PJ7/TOUT3) not connected to U5

Closed

INITX connected to reset circuit / supply monitor U5

Open

No connections to INITX

Closed

U5 watchdog function enabled

Open

U5 watchdog function disabled

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