Samsung S3F80JB manual Common Working Register Area C0H-CFH, RP1 → C8H-CFH

S3F80JB ADDRESS SPACES

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.

FFH

F0H

E0H

D0H

C0H

Set 1

FFH	Page 0
	Set 2
C0H
BFH
	Page 0

Following a hareware reset, register pointers RP0 and RP1 point to the common working register

area, locations C0H-CFH.

RP0 =	1	1	0	0	0	0	0	0
RP1 =	1	1	0	0	1	0	0	0

~ Prime ~

Area

00H

Figure 2-11. Common Working Register Area

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