Renesas PROM Programming Adapter PCA7435FPG02 Dokumentacja Pobierz pdf (Strona 10)

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Rev.3.00 Oct 23, 2006 page 10 of 53

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Memory

Special function register (SFR) area

The SFR area in the zero page contains control registers such as I/O

ports and timers.

RAM

RAM is used for data storage and for a stack area of subroutine calls

and interrupts.

ROM

The first 128 bytes and the last 2 bytes of ROM are reserved for

device testing and the rest is a user area for storing programs.

Interrupt vector area

The interrupt vector area contains reset and interrupt vectors.

Zero page

The 256 bytes from addresses 000016 to 00FF16 are called the zero

page area. The internal RAM and the special function registers (SFR)

are allocated to this area.

The zero page addressing mode can be used to specify memory and

only 2 bytes is possible in the zero page addressing mode.

Special page

The 256 bytes from addresses FF0016 to FFFF16 are called the spe-

cial page area. The special page addressing mode can be used to

specify memory addresses in the special page area. Access to this

area with only 2 bytes is possible in the special page addressing

mode.

Fig. 10 Memory map diagram

010016

000016

004016

044016

FF0016

FFEC16

FFFE16

FFFF16

256

384

XXXX

013F16

01BF16

8192

16384

E00016

C00016

E08016

C08016

YYYY16

ZZZZ16

RAM

ROM

Reserved area

SFR area

Not used

Interrupt vector area

ROM area

Reserved ROM area

(128 bytes)

Zero page

Special page

RAM area

RAM capacity

(bytes)

address

XXXX

ROM capacity

(bytes)

address

YYYY

Reserved ROM area

address

ZZZZ

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 55 56

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