CSTCC10.0MGA datasheet(13/153 Pages) STMICROELECTRONICS

13 / 153 page

ST72334J/N, ST72314J/N, ST72124J

13/153

4 REGISTER & MEMORY MAP

As shown in the Figure 5, the MCU is capable of

addressing 64K bytes of memories and I/O regis-

ters.

The available memory locations consist of 128

bytes of register locations, 384 or 512 bytes of

RAM, up to 256 bytes of data EEPROM and 4 or

8 Kbytes of user program memory. The RAM

space includes up to 256 bytes for the stack from

0100h to 01FFh.

The highest address bytes contain the user reset

and interrupt vectors.

IMPORTANT: Memory locations marked as “Re-

served” must never be accessed. Accessing a re-

served area can have unpredictable effects on the

device.

Figure 5. Memory Map

0000h

Interrupt & Reset Vectors

HW Registers

027Fh

0080h

16-bit Addressing

RAM

007Fh

0200h / 0280h

0BFFh

Reserved

0080h

(see Table 2)

0C00h

FFDFh

FFE0h

FFFFh

(see Table 5 on page 34)

027Fh

C000h

Reserved

256 Bytes Data EEPROM

0CFFh

0D00h

BFFFh

00FFh

0100h

01FFh

0200h

8K Bytes

E000h

16K Bytes

Program

Short Addressing RAM

Zero page

0080h

00FFh

01FFh

384 Bytes RAM

512 Bytes RAM

Stack or

16-bit Addressing RAM

0100h

Memory

Program

Memory

8 KBytes

E000h

C000h

16 KBytes

FFFFh

(128 Bytes)

(256 Bytes)

Short Addressing RAM

Zero page

Stack or

16-bit Addressing RAM

(128 Bytes)

(256 Bytes)

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