W78C438

SRAM 256
I/O 40
Timer 3*16-bit
UART 1
Status Mass Production
INT 4
Special Function 1MB external memory space

The Nuvoton standard 8051 series is pin-compatible with traditional 12T 8051 and operating at 2.4V ~ 5.5V and - 40 ℃ ~ 85 ℃.