ST7LITEUSX datasheet(8/108 Pages) STMICROELECTRONICS

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ST7LITEUSx

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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, 128 bytes of RAM and

1 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 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 (FE00h-FFFFh).

The size of Flash Sector 0 and other device op-

tions are configurable by Option byte.

IMPORTANT: Memory locations marked as “Re-

served” must never be accessed. Accessing a re-

seved area can have unpredictable effects on the

device.

Figure 5. Memory Map

Note:

1. 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 read-out

protection removal), then the RC calibration values can still be obtained through these addresses.

0000h

RAM

Flash Memory

(1K)

Interrupt & Reset Vectors

HW Registers

0080h

007Fh

(see Table 2)

FFE0h

FFFFh

(see Table 7)

0100h

00FFh

Short Addressing

RAM (zero page)

64-Byte Stack

00FFh

0080h

00C0h

(128 Bytes)

FC00h

FBFFh

Reserved

FFDFh

0.5 Kbytes

SECTOR 1

SECTOR 0

1K FLASH

FFFFh

FE00h

FDFFh

FC00h

PROGRAM MEMORY

DEE0h

RCCRH0

RCCRL0

DEE1h

see section 6.1 on page 17

RCCRH1

RCCRL1

DEE2h

DEE3h

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