. . . "Subfamilies include the 8/16-bit H8/300 and H8/500, the 16/32-bit H8/300H and H8S and the 32-bit H8SX series, each with dozens of different variants, varying by speed, selection of built in peripherals such as timers and serial ports, and amounts of ROM and Flash-Memory and RAM. Built in ROM and Flash-Memory tends to range from 16 KB to 1024 KB, and RAM from 512 B to 512 KB." . .