AT87C52 AT89C2051 Errata AT89LV55 AT87C55WD AT89C2051 AT89S4D12 AT87F51 AT89C4051 AT89S51 AT87F51RC AT89C51 AT89S52 errata AT87F52 AT89C51RC AT89S52 AT87F55WD AT89LS52 AT89S53 AT87LV51 AT89LS53 AT89S8252 AT87LV52 AT89LS8252 AT89S-LS8252 Errata 1 AT87LV55 AT89LV51 AT89S-LS8252 Errata 2 AT89C1051 AT89LV52