ST7LITE1XB datasheet(9/157 Pages) STMICROELECTRONICS

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ST7LITE1xB

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3 REGISTER & MEMORY MAP

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

dressing 64K bytes of memories and I/O registers.

The available memory locations consist of 128

bytes of register locations, 256 bytes of RAM, 128

bytes of data EEPROM and up to 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 Fig-

ure 5) mapped in the upper part of the ST7 ad-

dressing space so the reset and interrupt vectors

are located in Sector 0 (F000h-FFFFh).

The size of Flash Sector 0 and other device op-

tions are configurable by Option byte (refer to sec-

tion 15.1 on page 148).

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

RAM

Flash Memory

(2K or 4K)

Interrupt & Reset Vectors

HW Registers

0080h

007Fh

0FFFh

(see Table 2)

1000h

107Fh

FFE0h

FFFFh

(see Table 5)

0180h

Reserved

017Fh

Short Addressing

RAM (zero page)

0080h

00FFh

(128 Bytes)

Data EEPROM

(128 Bytes)

F000h

1080h

EFFFh

Reserved

FFDFh

128 Bytes Stack

0100h

017Fh

1 Kbyte

3 Kbytes

(SECTOR 1)

(SECTOR 0)

4K FLASH

FFFFh

FC00h

FBFFh

F000h

PROGRAM MEMORY

DEE0h

RCCRH1

RCCRL1

see section 7.1 on page 23

00FFh

01FFh

0100h

Reserved

RAM

(128 Bytes)

Reserved

0200h

0180h

01FFh

DEE1h

DEE2h

RCCRH0

RCCRL0

DEE3h

1 Kbyte

(SECTOR 1)

(SECTOR 0)

2K FLASH

FFFFh

FC00h

FBFFh

F800h

PROGRAM MEMORY

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