beautypg.com

Samsung S3F80JB User Manual

Page 41

background image

S3F80JB

ADDRESS SPACES

2-9

PRIME REGISTER SPACE

The lower 192 bytes of the 256-byte physical internal register file (00H–BFH) are called the prime register space
or, more simply, the prime area. You can access registers in this address using any addressing mode. (In other
words, there is no addressing mode restriction for these registers, as is the case for set 1 and set 2 registers.).
The prime register area on page 0 is immediately addressable following a reset.

FFH

FCH

E0H

D0H

C0H

Bank 0

FFH

C0H

Set 2

00H

Prime

Register

Area

Peripheral and IO

General-purpose

CPU and system control

Set 1

Bank 1

Page 0

Page 0

BFH

Figure 2-5. Set 1, Set 2, and Prime Area Register Map