ST90E158 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST90E158

8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM

STMicroelectronics 

ST90158 - DEVICE ARCHITECTURE

2.4 MEMORY ORGANIZATION

Code and data are accessed within the same line-

ar address space. All of the physically separate

memory areas, including the internal ROM, inter-

nal RAM and external memory are mapped in a

common address space.

The ST9+ provides a total addressable memory

space of 4 Mbytes. This address space is ar-

ranged as 64 segments of 64 Kbytes; each seg-

ment is again subdivided into four 16 Kbyte pages.

The mapping of the various memory areas (inter-

nal RAM or ROM, external memory) differs from

device to device. Each 64-Kbyte physical memory

segment is mapped either internally or externally;

if the memory is internal and smaller than 64

Kbytes, the remaining locations in the 64-Kbyte

segment are not used (reserved).

Refer to the Register and Memory Map Chapter

for more details on the memory map.

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