INTEGRATED CIRCUITS P83C557E4/P80C557E4/P89C557E4.
NXP
P80C557E4 - Single-chip 8-bit microcontroller
INTEGRATED CIRCUITS P83C557E4/P80C557E4/P89C557E4 Single-chip 8-bit microcontroller Product specification Supersedes data of 1999 Feb 15 1999 Mar 02 .