ST7LUS5 datasheet(14/124 Pages) STMICROELECTRONICS

14 / 124 page

ST7LUS5, ST7LU05, ST7LU09

14/124

As shown in Figure 3 and 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, 128 bytes of RAM

and 1 Kbyte or 2 Kbytes of user program memory. The RAM space includes up to 64 bytes

for the stack from 00C0h to 00FFh.

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

The Flash memory contains two sectors (see Figure 3 and Figure 4) mapped in the upper

part of the ST7 addressing space whereas the reset and interrupt vectors are located in

Sector 0 (FE00h-FFFFh for the ST7LUS5 and FA01h-FFFFh for the ST7LU05/ST7LU09).

The size of Flash sector 0 and other device options are configurable by the option bytes.

Caution:

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

area can have unpredictable effects on the device.

Figure 3.

Memory map (ST7LUS5)

DEE0h, DEE1h, DEE2h and DEE3h addresses are located in a reserved area but are special bytes containing also the RC

calibration values which are read-accessible only in user mode. If all the EEPROM data or Flash space (including the RC

calibration values locations) has been erased (after the readout protection removal), then the RC calibration values can still

be obtained through these addresses.

Size configurable by option byte

0000h

RAM

Flash Memory

(1 Kbyte)

Interrupt and Reset Vectors

HW Registers

0080h

007Fh

(see Table 3)

FFE0h

FFFFh

(see Table 15)

0100h

00FFh

Short Addressing

RAM (zero page)

64-byte Stack

00FFh

0080h

00C0h

(128 bytes)

FC00h

FBFFh

Reserved

FFDFh

0.5 to 1 Kbytes

0 to 0.5 Kbytes

SECTOR 1

SECTOR 0(2)

1Kbyte Flash

FFFFh

FE00h

FDFFh

FC00h

Program Memory

DEE0h(1)

RCCRH0

RCCRL0

DEE1h(1)

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