"The H8S/21xx series is based around a high performance CPU. It is the same CPU found in the H8S/22xx & H8S/23xx 16 bit microcontrollers. This means that the general registers are increased from 16 bits to 32 bits. The program counter is increasedfrom 16 bits to 24 bits. This increases the possible allowable address range from 64 k to 16 Mbyte. This is how the H8S/21x4 devices support 128k of on chip code memory. The CPU executes instructions in a minimum of 1 cycle time, 50 ns @ 20 MHz.
Theclocking frequency is increased from 16 MHz to 20 MHz.
Module standby is introduced on these devices allowing the user to turn off any peripherals that arent being used. 6 power saving modes are offered on the H8S devices, an increase over the H8/300devices."
|H8S/2258, 2239, 2238, 2237, 2227|