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Chapter 7 Other circuitry
7.1
7.2
7.3
R20UT4084ED0130 Rev. 1.3
2020-05-12
Signalling for ERROROUT_M
A red LED (LED4) is available two indicate a "low" output signal from
ERROROUT_M.
Pin Headers for Pull-Down and Pull-Up
A connector CN9 is available to enable easy connection to 3.3V / 5V or GND via
pull-up or pull-down resistances, respectively.
Hereby uneven pins from 1 to 19 (in total ten) are configured as pull-up pin
headers, while the even numbers from 2 to 20 (in total ten) can be used for pull-
down. JP25 and JP32 configure the voltage connected to the uneven pins to
3.3V or 5V. JP25 configures uneven pins 1 – 9 and JP32 configures uneven pins
11 – 19.
By connecting device port pins from CN5 – 8 to CN9 it is therefore possible to
pull a desired port pin to "Low" or "High".
Signalling LEDs
Eight LEDs are provided to allow visual observation of the output state of device
pins. Device pins P33_0 to P33_7 are connected to the uneven pins 15 to 1 of
the pin header CN4, while the LEDs 6 to 13 are connected to the even pins 16 to
2, respectively. Thus, the LEDs can be connected to the device port pins P33_0
to P33_7 via jumper at CN4 or to any device port pin by connecting directly to the
even pin headers of CN4.
15
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