Datasheet

MCP79410/MCP79411/MCP79412
DS20002266E-page 54  2010-2013 Microchip Technology Inc.
APPENDIX A: REVISION HISTORY
Revision A (10/2010)
Original release of this document.
Revision B (03/2011)
Minor typographical edits;
Added Appendix B: Device Errata
Revision C (07/2011)
Updated Section 4.2.6, Crystal Specs; Revised Figure
4-4.
Revision D (12/2011)
Added DC/AC Char. Charts
Revision E (04/2013)
Revised Features page; Revised Schematic, Block
Diagram; Added detailed descriptions for Registers.
Minor updates to the overall content.
APPENDIX B: DEVICE ERRATA
Devices with silicon revision prior to A4 (date code prior
to 11/10) have an errata where the AM/PM bit (Bit 5 in
register 02h) may be flipped if the oscillator is stopped.
This is coincident with the OSCON bit getting cleared.
This can occur due to the following conditions:
• The oscillator is stopped on the application.
• The oscillator is stopped by clearing the ST bit (Bit
7 in register 00h).
• The external CMOS source is stopped in
EXTOSC mode.
The work-around is to determine when the OSCON bit
is cleared and check in software for AM/PM bit corrup-
tion.
Devices with silicon revision A4 or later (date code after
11/09) do not have this issue.