TEMIC TSC80C51CXXX-L20MA/883 datasheet, TSC80C51CXXX-L20MA/883 is CMOS single-chip 8 bit microcontroller, 4Kx8 mask ROM, 128 bytes of RAM, 32 I/O lines, 16 bit timers, (XXX=secret ROM version), 20 MHz, low power