GMS90L54/GMS90L56/GMS90L58 pdf datasheet (Low voltage versions)
? 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
? P-DIP-40, P-LCC-44, P-MQFP-44 package