S3C8639 View Datasheet(PDF) - Samsung

Part Name

Description

View to exact match

S3C8639

8-bit single-chip CMOS microcontrollers

Samsung 

ADDRESS SPACES

S3C8639/C863A/P863A/C8647/F8647

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

This16-byte address range is called common working register 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

FCH

E0H

DFH

CFH

C0H

Set 1

Page 0

Page 1

Page 2

Page 3 (S3C863A only)

FFH

FFH

Set 2

Set 2 Set 2 Set 2

C0H

C0H

BFH

BFH

Register pointers RP0 and RP1 point to the

common working register area, locations

C0H-CFH, after a reset.

RP0 = 1 1 0 0 0 0 0 0

~

Prime

Area

~

~~

Prime

Area

~~

Prime Prime

Area Area

RP1 = 1 1 0 0 1 0 0 0

00H

00H

Figure 2-12. Common Working Register Area (S3C863X)

2-14

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