ST7265X View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7265X

Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM

STMicroelectronics 

ST7265x

3 REGISTER & MEMORY MAP

As shown in Figure 11, the MCU is capable of ad-

dressing 64 Kbytes of memories and I/O registers.

The available memory locations consist of 80

bytes of register locations, up to 5 Kbytes of RAM

and up to 32 Kbytes of user program memory. The

RAM space includes up to 256 bytes for the stack

from 0100h to 01FFh.

Figure 11. Memory Map

The highest address bytes contain the user reset

and interrupt vectors.

IMPORTANT: Memory locations noted “Re-

served” must never be accessed. Accessing a re-

served area can have unpredictable effects on the

device.

0000h

004Fh

0050h

HW Registers

(see Table 4)

512 Bytes RAM*

144Fh

5 KBytes RAM*

1450h DTC RAM (Write protected)

154Fh

256 Bytes

USB Data Buffer**

1A4Fh

1280 Bytes

7FFFh

8000h

Reserved

Program Memory*

C000h

32 Kbytes

16 Kbytes

FFDFh

FFE0h

FFFFh

Interrupt & Reset Vectors

(see Table 10)

0050h

00FFh

0100h

01FFh

0200h

Short Addressing

RAM (176 Bytes)

Stack (256 Bytes)

16-bit Addressing RAM

(80 Bytes)

024Fh

0050h

00FFh

0100h

01FFh

0200h

Short Addressing

RAM (176 Bytes)

Stack (256 Bytes)

16-bit Addressing RAM

(4688 Bytes)

144Fh

* Program memory and RAM sizes are product dependent (see Table –)

** The ST7 core is not able to read or write in the USB data buffer if the ST7265x is running at 6Mz in stan-

dalone mode.

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