ST7293C3B6 datasheet(65/69 Pages) STMICROELECTRONICS

65 / 69 page

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ST7293

1.3 MEMORY MAP

As shown in Figure 3, the MCU is capable of ad-

dressing 8192 bytes of memory and I/O registers.

In the ST7293, 3604 of these bytes are user ac-

cessible.

The locations consist of 32 bytes of I/O registers

(only 20 are used), 128 bytes of RAM, 128 bytes

of EEPROM and 3.25Kbytes of user ROM. The

RAM space includes 64 bytes for the stack from

0FFh to 0C0h. Programs that only use a small part

of the allocated stack locations for interrupts and/

or subroutine stacking purpose can use the re-

maining bytes as standard RAM locations.

The highest address bytes contains the user de-

fined reset and interrupt vectors.

Figure 3. Memory Map

I/O and REGISTERS

Bytes

RAM

128 Bytes

(STACK)

64 Bytes

128 Bytes

RESERVED

4096 Bytes

3.25K USER ROM

3328 Bytes

RESERVED

240 Bytes

PORT A DATA REGISTER

PORT B DATA REGISTER

PORT C DATA REGISTER/INTERRUPTS

PORT A DATA DIRECTION REGISTER

PORT B DATA DIRECTION REGISTER

PORT C DATA DIRECTION REGISTER

EEPROM CONTROL REGISTER

MISCELLANEOUS REGISTER

TIMER CONTROL REGISTER

TIMER STATUS REGISTER

CAPTURE HIGH REGISTER 1

CAPTURE LOW REGISTER 1

COUNTER HIGH REGISTER

COMPARE LOW REGISTER 1

COMPARE HIGH REGISTER 1

COUNTER LOW REGISTER

ALTERNATE COUNTER HIGH REGISTER

ALTERNATE COUNTER LOW REGISTER

COMPARE HIGH REGISTER 2

PORTS

6 Bytes

EEPROM/CPULK

CONTROL 1 Byte

MISCELLANEOUS

1 Byte

TIMER

12 Bytes

00h

01h

02h

03h

04h

05h

06h

07h

08h

09h

0Ah

0Bh

0Ch

0Dh

0Eh

0Fh

10h

11h

12h

13h

14h

15h

16h

17h

18h

19h

1Ah

1Bh

1Ch

1Dh

1Eh

COMPARE LOW REGISTER 2

1Fh

0000

0031

0127

0191

0192

0255

0256

0512

0511

4607

4608

7935

7936

8175

8176

0000h

1FEFh

1F00h

1EFFh

1200h

11FFh

01FFh

0200h

00FFh

00C0h

00BFh

VR001107

EEPROM

RESERVED

1FFFh

USER VECTORS

16 Bytes

8191

1FF0h

007Fh

0080h

96 Bytes

RESERVED

128 Bytes

0128

0032

0384

0383

017Fh

0180h

001Fh

0020h

0100h

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