Features

  ◆ 80C51 Central Processing Unit
  ◆ 3V / 5V operation voltage, built-in Low-Voltage Reset circuit. 
  ◆ Optional 12T or 6T mode
  ◆ Max operation frequency up to 48MHz@12T or 24MHz@6T
  ◆ 4KB on-chip program memory 
  ◆ ISP capability; optional 1KB/2KB/4KB ISP memory shared with data flash memory.
  ◆ IAP capability; up to 11K byte programmable data flash available shared with ISP memory.
  ◆ On-chip 256 byte scratch-pad RAM and 256 byte auxiliary RAM; Be capable of addressing
     up to 64K bytes external memory
  ◆ MOVC-disabling, encrypting, and locking flash memory realize security mechanism.
  ◆ Three 16-bit timer/counter, Timer2 is an up/down counter with programmable clock output on
     P1.0
  ◆ Eight sources, four-level-priority interrupt capability
  ◆ Enhanced UART, provides frame-error detection and hardware address-recognition
  ◆ Dual DPTR for fast-accessing of data memory
  ◆ 15 bits Watch-Dog-Timer with 8-bit pre-scalar, one-time enabled
  ◆ Power control: idle mode and power-down mode; Power-down can be woken-up by
     P3.2/P3.3/P4.2/P4.3
  ◆ Low EMI: inhibit ALE emission
  ◆ Four 8-bit bi-directional ports; extra four-bit additional P4 are available for PLCC-44 and 
     PQPF-44
  ◆ On-Chip flash program/data memory:
     ＊ The data endurance of the embedded flash gets over 20,000 times.
     ＊ 21 years data retention is guaranteed.
  ◆ Three package types: 
     ＊ PDIP 40: MPC89L51AE
     ＊ PLCC 44: MPC89L51AP
     ＊ PQFP 44: MPC89L51AF