ST7LITE49M datasheet(18/188 Pages) STMICROELECTRONICS

18 / 188 page

ST7LITE49M

18/188

As shown in Figure 4, the MCU is capable of addressing 64 Kbytes of memories and I/O

registers.

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

RAM, 128 bytes of data EEPROM and 4 Kbytes of Flash 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 4) mapped in the upper part of the ST7

addressing space so the reset and interrupt vectors are located in Sector 0 (FFE0h-FFFFh).

The size of Flash Sector 0 and other device options are configurable by option bytes (refer

to Section 14.1 on page 175).

Caution:

Memory locations marked as “Reserved” must never be accessed. Accessing a reserved

area can have unpredictable effects on the device.

Figure 4.

Memory map

0000h

Flash Memory

(4K)

Interrupt & Reset Vectors

HW registers

0080h

007Fh

0FFFh

(seeTable 3)

1000h

107Fh

FFE0h

FFFFh

(see Table 17)

Reserved

Short Addressing

RAM (zero page)

0080h

00FFh

Data EEPROM

(128 bytes)

F000h

1080h

EFFFh

Reserved

FFDFh

128 bytes Stack

0100h

017Fh

1 Kbyte

3 Kbytes

(SECTOR 1)

(SECTOR 0)

4K Flash

program memory

DEE0h

RCCRH1

RCCRL1

see Section 7.1.1

01FFh

0200h

RAM

(384 bytes)

0180h

01FFh

DEE1h

DEE2h

RCCRH0

RCCRL0

DEE3h

FFFFh

F000h

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