ST7DALIF2 datasheet(16/171 Pages) STMICROELECTRONICS

16 / 171 page

ST7DALIF2

16/171

As shown in Figure 3, the MCU is capable of addressing 64K bytes of memories and I/O

registers.

The available memory locations consist of 128 bytes of register locations, 384 bytes of

RAM, 256 bytes of data EEPROM and 8 Kbytes of user program memory. The RAM space

includes up to 128 bytes for the stack from 180h to 1FFh.

The highest address bytes contain the user reset and interrupt vectors.

The Flash memory contains two sectors (see Figure 3) mapped in the upper part of the ST7

addressing space so the reset and interrupt vectors are located in Sector 0 (F000h-FFFFh).

The size of Flash Sector 0 and other device options are configurable by Option byte (refer to

Section 22.1 on page 161).

Note:

IMPORTANT: memory locations marked as “Reserved” must never be accessed. Accessing

a reserved area can have unpredictable effects on the device.

Figure 3.

Memory map

0000h

RAM

Flash Memory

(8K)

Interrupt & Reset Vectors

HW Registers

0080h

007Fh

0FFFh

(see Table 3)

1000h

10FFh

FFE0h

FFFFh

(see Table 15)

0200h

Reserved

01FFh

Short Addressing

RAM (zero page)

128 Bytes Stack

0180h

01FFh

0080h

00FFh

(384 Bytes)

Data EEPROM

(256 Bytes)

E000h

1100h

DFFFh

Reserved

FFDFh

16-bit Addressing

RAM

0100h

017Fh

1 Kbyte

7 Kbytes

SECTOR 1

SECTOR 0

8K FLASH

FFFFh

FC00h

FBFFh

E000h

PROGRAM MEMORY

1000h

1001h

RCCR0

RCCR1

see Section 9.2 on page 32

FFDEh

FFDFh

RCCR0

RCCR1

see Section 9.2 on page 32

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