68300

Hi everyone

A question about the need for, and values of pull up resistors on the MOSI,
MISO and SS pins of the QSPI of a 68331.

The 68331 Users Manual: -
Section 6.3.3 QSPI Pins states that the above pins "should have" pull up
resistors.
Section 3.3 Pin Descriptions states that these pins are of type Bo ( Type B
that can be operated in open drain mode )

A quick review of the 683xx Application notes I can locate - none show any
pull ups on these pins.

If the 68331 QSPI is used for an SPI bus with 2 SPI peripherals connected to
them: -
Should pull ups be used on all/any of these pins?
If so any suggestions on how to arrive at the resistor values?

We intend to use the 3V3 varaint of the 68331.

Thanks for any hints you can provide.
-
Robert Manktelow
Telspec Europe Ltd, Rochester, ME1 3QU
Phone +44 (0)1634 687 133 Ext 2348