CAUSE: | You set the Input Reference logic option to As VREFA or As VREFB , but you did not enable the VREF A or VREF B pin. |
ACTION: | Enable the VREF A or VREF B pin, for example, by turning on Enable VREF A pin or Enable VREF B pin in the General tab of the Device & Pin Options dialog box. |
See also:
Overview: Making Assignments
Specifying General Device Options
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