SK-91470-144PMC1-MC User Guide
Chapter 4 Jumpers and Switches
FMEMCU-UG-910067-10
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© Fujitsu Microelectronics Europe GmbH
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
Setting
Description
Closed
SIN2 of MCU is connected to UART2
JP17 (SIN2)
Open
SIN2 not connected to UART2
Closed
SOT2 of MCU is connected to UART2
JP18 (SOT2)
Open
SOT2 not connected to UART2
Closed
RTS and CTS of X7 are connected
JP19 (RTS-CTS)
Open
RTS and CTS of X7 are not connected
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
Setting
Description
1 - 2
DTR of UART0 is selected for reset generation
JP9
2 - 3
DTR of UART1 is selected for reset generation
Closed
MCU Pin 17 (PJ7/TOUT3) connected to U5
JP23 (WD_TOUT3)
Open
MCU Pin 17 (PJ7/TOUT3) not connected to U5
Closed
INITX connected to reset circuit / supply monitor U5
JP25 (Ext. Reset)
Open
No connections to INITX
Closed
U5 watchdog function enabled
JP30
(Watchdog)
Open
U5 watchdog function disabled
