Datasheet

ATmega48A/PA/88A/PA/168A/PA/328/P
 2018 Microchip Technology Inc. Data Sheet Complete DS40002061A-page 641
40. Errata
40.1 Errata ATmega48A
The revision letter in this section refers to the revision of the ATmega48A device.
40.1.1 Rev K
•
Full swing crystal oscillator not supported
• Parallel programming timing modified
• Write wait delay for NVM is increased
• Changed device ID
1. Full swing crystal oscillator not supported
The full swing crystal oscillator functionality is not available in revision K.
Problem fix/workaround
Use alternative clock sources available in the device.
2. Parallel programming timing modified
3 Write wait delay for NVM is increased
The write delay for non-volatile memory (NVM) is increased as follows:
4. Changed device ID
The device ID has been modified according to the to the following:
40.1.2 Rev. E to J
Not Sampled
Previous die revision Revision K
Symbol Parameter Min Typ. Max Units Min Typ. Max Units
t
WLRH_CE
/WR Low to
RDY/BSY High
for Chip Erase
7.5 9 ms 9.8 10.5 ms
t
BVDV
/BS1 Valid to
DATA valid
0 250 ns 0 335 ns
t
OLDV
/OE Low to DATA
Valid
250 ns 335 ns
Other revisions Revision K
Symbol Minimum Wait Delay Minimum Wait Delay
t
WD_ERASE
9ms 10.5ms
Any die revision Previous die revision Revision K
Signature byte address ID
(Unchanged)
Device ID read via
debugWIRE
Device ID read via
debugWIREPart 0x000 0x001 0x002
ATmega48A 0x1E 0x92 0x05 0x920A 0x920A