Specifications:

• Fully compatible to standard MCS-51 microcontroller • Wide operating frequency up to 40MHz (for more detail, see “GMS90 Series Selection Guide”) • 16K/24K/32K bytes (EP)ROM • 256 × 8 RAM • 64K external program memory space • 64K external data memory space • Four 8-bit ports • Three 16-bit Timers / Counters (Timer2 with up/down counter feature) • USART • One clock output port • Programmable ALE pin enable / disable • Six interrupt sources, two priority levels • Power saving Idle and power down mode • Quick pulse programming algorithm (in the OTP devices) • 2-level program memory lock (in the OTP devices) • 2.7Volt low voltage version available