ST7293C3B1 datasheet(51/69 Pages) STMICROELECTRONICS

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ST72E94 - ST72T94

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 ST72E94, 7696 of these bytes are user ac-

cessible.

Note:

In the ST7293 only 3.25K bytes are user accessi-

ble. This should be taken into account by the user

when programming the ST72E94 to emulate the

ST7293.

The locations consist of 32 bytes of I/O registers

(only 20 are used), 224 bytes of RAM, 256 bytes

of EEPROM and 6Kbytes 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 sub-

routine stacking purpose can use the remaining

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

32 Bytes

RAM

224 Bytes

(STACK)

64 Bytes

256 Bytes

RESERVED

1280 Bytes

RESERVED

240 Bytes

PORT C WAKE-UP (High Byte)

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/CBULK

CONTROL 1 Byte

Miscellaneus

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

0032

0191

0192

0255

0256

0512

0511

1791

1792

7935

7936

8175

8176

0000h

1FFFh

1FF0h

1FEFh

1F00h

1EFFh

0700h

06FFh

01FFh

0200h

00FFh

00C0h

00BFh

VR01847C

EEPROM

RESERVED

1FFFh

1FF4h

1FF5h

1FF6h

1FF7h

1FF8h

1FF9h

1FFAh

1FFBh

1FFCh

1FFDh

1FFEh

0100h

PORT C WAKE-UP (Low Byte)

TIMER OVERFLOW (High Byte)

TIMER OVERFLOW (Low Byte)

TIMER OUTPUT COMPARES (High Byte)

TIMER OUTPUT COMPARES (Low Byte)

TIMER INPUT CAPTURE (High Byte)

TIMER INPUT CAPTURE (Low Byte)

EXTERNAL INTERRUPT (INT) (High)

EXTERNAL INTERRUPT (INT) (Low)

TRAP INSTRUCTION (High Byte)

TRAP INSTRUCTION (Low Byte)

RESET and POWER ON (POR) (High)

RESET and POWER ON (POR) (Low)

USER VECTORS

16 Bytes

8191

1FF0h

1FF1h

001Fh

0020h

1FF3h

NOT USED

1FF2h

NOT USED

Option Byte (1)

0513

0201h

(1) Only on EPROM/OTP Version

6K USER

ROM or EPROM

6144 Bytes

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