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3.5 Subclock (JP: 36,37)

Some devices like e.g. MB90F387 support a 32kHz subclock (X0A, X1A), other devices like

MB90FxxxS do not support a subclock but will offer additional port-pins (P35, P36) instead.

Please check the related datasheet.

JP36: defines usage of Pin 46 (X0A/P35)

JP37: defines usage of Pin 47 (X1A/P36)

Jumper

JP36 (X0A/P35)

JP37 (X1A/P36)

Default: JP36: 1-4, JP37: 1-2

By default, the 32kHz-subclock-crystal is connected to the microcontroller.

UG-900002-20

FLASH-CAN-48P

Chapter 3 Jumpers and Switches

Setting

Description

1-4

Pin 46 is connected to the 32kHz Subclock (X0A)

2-4

Pin 46 is used as P35 and is connected to X4-A28

Pin 46 is connected to GND (in case that subclock-

3-4

device is used, but no 32kHz crystal is connected)

1-2

Pin 47 is connected to the 32kHz Subclock (X1A)

2-3

Pin 47 is used as P36 and is connected to X4-C29

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Pin-out JP36: