AMI S2200 microcontroller family

American Microsystems, Inc (AMI) S2200 is an enhanced version of AMI S2000 4-bit microcontroller. The S2200 has larger size of on-chip ROM, up to 4 KB ROM depending on part number, but the maximum external memory size stayed the same - 8 KB. On-chip RAM memory was expanded to 128 words, or 64 bytes. The MCU has 12 new instructions and supports two-level interrupts. To accommodate interrupts, program counter stack was increased to 5 levels, and all other registers and a carry flag added separate 2-level interrupt stacks. These improvements were also useful for applications that didn't use interrupts, as the applications could nest subroutines to 5 levels rather than three. Whereas the S2000 MCU included 2 program controllable flags, that could be set, reset and tested by programs, the S2200 includes 262 of such flags. The S2200 microcontrollers has better programmable timer/counter, and add A/D and D/A converters. The S2200 MCU uses lower 5 Volt power supply. To further reduce power consumption, the parts could be ordered with RAM power-down option.

The AMI S2200 microcontrollers were packaged into 40-pin plastic or ceramic DIP package. Like on the S2200 microcontrollers, certain optional pins on the S2200 could be eliminated, and the MCU could be ordered in 28-pin plastic and ceramic package.