ST90135M4 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

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ST90135M4

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

STMicroelectronics 

ST90158 - REGISTER AND MEMORY MAP

3.3 MEMORY MAP

Figure 18. Memory Map

Internal

20FFFFh

RAM

768 bytes

20FD00h

1 Kbytes

20FC00h

1.5 Kbytes

20FA00h

2 Kbytes

20F800h

3FFFFFh

External

Memory

Reserved

Upper Memory

(usually RAM mapped

in Segment 23h)

230000h

22FFFFh

SEGMENTS 21h and 22h

128 Kbytes

210000h

20FFFFh

20C000h

20BFFFh

208000h

207FFFh

204000h

203FFFh

200000h

1FFFFFh

PAGE 83 - 16 Kbytes

PAGE 82 - 16 Kbytes SEGMENT 20h

PAGE 81 - 16 Kbytes 64 Kbytes

PAGE 80 - 16 Kbytes

64 Kbytes

00FFFFh

48 Kbytes

00BFFFh

32 Kbytes

Internal

007FFFh

00FFFFh

ROM

24 Kbytes

000000h

External

Memory

Internal ROM/EPROM

(external ROM on

ROMless devices)

010000h

00FFFFh

00C000h

00BFFFh

008000h

007FFFh

004000h

003FFFh

000000h

Lower Memory

(usually ROM/EPROM mapped

in Segment 1)

PAGE 3 - 16 Kbytes

PAGE 2 - 16 Kbytes

PAGE 1 - 16 Kbytes

PAGE 0 - 16 Kbytes

SEGMENT 0

64 Kbytes

Note: The total amount of directly addressable external memory is 64 Kbytes.

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