ST7L19 datasheet(7/138 Pages) STMICROELECTRONICS

7 / 138 page

ST7L15, ST7L19

7/138

3 REGISTER AND MEMORY MAP

As shown in Figure 3, the MCU can address

64 Kbytes 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 3) 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 126).

IMPORTANT: Memory locations marked as “Re-

served” must never be accessed. Accessing a re-

served area can have unpredictable effects on the

device.

Figure 3. Memory Map

Notes:

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 readout protection removal), then the RC calibration values

can still be obtained through these four addresses.

0000h

RAM

Flash Memory

(4K)

Interrupt and 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 21

and note 1.

00FFh

01FFh

0100h

Reserved

RAM

(128 bytes)

Reserved

0200h

0180h

01FFh

DEE1h

DEE2h

RCCRH0

RCCRL0

DEE3h

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