Fujitsu MB96300 manual Reset Generation JP 33, 41, 46, 47, Uart Reset, Rst Mcu, Reset Connection

SK-96370-144PMC-GDC User Guide

Chapter 3 Jumpers and Switches

3.6Reset 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		Setting	Description
JP33	1-2		X5 (UART0) is used to generate Reset
(UART RESET)	2-3		X9 (UART2) is used to generate Reset
JP41	1-2		No polarity inversion for the DTR/RTS signal
(DTR / DTRx)	2-3		Polarity inversion for the DTR/RTS signal
JP46	1-2		Reset is applied immediately when SW6 is pressed
(Reset imm./delayed)	2-3		Reset is applied when SW6 is pressed > 2sec
JP47	1-2		The voltage supply monitor observes 1V8
(Monitor 1V8 / 2V5)		2-3	The voltage supply monitor observes 2V5
JP48		Closed	External reset generation is active
(RST MCU)		Open	No external reset generation

Table 3-5: Reset Connection

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 - 18 - © Fujitsu Microelectronics Europe GmbH