HE80170L Datasheet, Jess Technology

! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Operating Voltage: Operation frequency Range: ROM size: RAM size: Dual Clock: 2.4V
  – 5.2V DC ~ 8MHz @ 5.0V DC ~ 4MHz @ 2.4V .

External Fast Clock pin. Mask Option settings : Connecting to crystal or MO_FCK/SCKN=00：Slow Clock only RC to generate 32.768KHz 01：Illegal ~ 8MHz frequency. 10：Dual Clock 11：Fast Clock only MO_FOSCE=0：Internal fast oscillation 1：External fast oscill.