ST72321BXXX-AUTO View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72321BXXX-AUTO

8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

STMicroelectronics 

Register and memory map

3

Register and memory map

ST72321Bxxx-Auto

Caution:

As shown in 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, up to 2 Kbytes of

RAM and up to 60 Kbytes of user program memory. The RAM space includes up to 256

bytes for the stack from 0100h to 01FFh.

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

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

area can have unpredictable effects on the device.

Related documentation

Executing Code in ST7 RAM (AN 985)

Figure 4. Memory map

0000h

007Fh

0080h

HW Registers

(see Table 3)

RAM

(2048, 1536 or 1024 bytes)

087Fh

0880h

0FFFh

1000h

Reserved

Program Memory

FFDFh

(60, 48 or 32 Kbytes)

FFE0h Interrupt and Reset Vectors

FFFFh

(see Table 19)

0080h

00FFh

0100h

01FFh

0200h

or 047Fh

or 067Fh

or 087Fh

Short Addressing

RAM (zero page)

256 bytes Stack

16-bit Addressing

RAM

1000h

4000h

8000h

60 Kbytes

48 Kbytes

32 Kbytes

FFFFh

32/247

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