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ADDRESS SPACES S3C8235B/F8235B COMMON WORKING REGISTER AREA (C0H–CFH) After a reset, register pointers RP0 and RP1 automatically select two 8-byte register slices in set 1, locations C0H– CFH, as the active 16-byte working register block: RP0 → C0H–C7H RP1 → C8H–CFH This 16-byte address range is called common area. That is, locations in this area can be used as working registers by operations that address any location on any page in the register file. Typically, these working registers serve as temporary buffers for data operations between different pages. FFH FFH Set 1 FFH FCH Page 1 Page 0 Set 2 E0H D0H C0H BFH C0H Following a hardware reset, register pointers RP0 and RP1 point to the common working register area, locations C0H-CFH. Page 0 ~ Prime Space ~ ~ Page 2 17H RP0 = 1100 0000 RP1 = 1100 1000 LCD Data Register Area 00H Figure 2-11. Common Working Register Area 2-14 00H
