1.2.1 Internal Pull-up on MCLR Pin Enabled Late
When the external master clear is selected, an internal pull-up feature is enabled. Because the internal pull-up feature happens later in the initialization sequence than expected, it can cause the device to become stuck in an initialization-Reset loop.
Work around
Use an external pull-up resistor on the MCLR pin when the external master clear configuration is selected.
Affected Silicon Revisions
| A8 | B2 |
| X | X |