Meaning of AT89C51 and PIC16F877

[mudasir]

origin of microcontroller at89s51

In AT89C51, AT stands for Atmel , C stands for CMOS
What 89 and 51 stands for?????????

Also kindly can anyone tell what is the meaning of each letter in
PIC16F877 and PIC18F458

 

[Los Frijoles]

what is the meaning of pic16f877a series

PIC = Programmable interface controller or some variation on that
16 = the series: 14-bit core
F = flash memory
877/458 = the specific model number basically

As for the atmel, I am not sure.