z 1-T 8051 CPU Core
z 16K bytes of on-chip Flash program memory with ISP/IAP function
z 256 bytes internal scratch-pad RAM and 576 bytes on-chip expanded RAM (XRAM)
z Dual DPTR (Data Pointer register)
z Four and half configurable I/O ports
z Three 16-bits Timers
z Enhanced UART
z Two-priority-level interrupt structure
z Four external interrupts, INT0, INT1, INT2 and INT3
z Keypad interrupt (P0)
z Wake-up from power-down mode and idle mode
z Serial Peripheral Interface (SPI)
z 2-wire Serial Inte.