SM39R08A5U10MP 参数 Datasheet PDF下载

SM39R08A5

8-Bit Micro-controller

with 8KB Flash

& 256B RAM embedded

3.2. Data Memory

The SM39R08A5 has 256Bytes on-chip SRAM; 256 Bytes of it are the same as general 8052 internal memory structure

FF

FF

Higher 128 Bytes (Accessed by

indirect addressing mode only)

80

7F

SFR (Accessed by direct addressing

mode only)

80

Lower 128 Bytes (Accessed by

direct & indirect addressing mode )

00

Fig. 3-2: RAM architecture

3.2.1. Data memory - lower 128 byte (00h to 7Fh)

Data memory 00h to FFh is the same as 8052.

The address 00h to 7Fh can be accessed by direct and indirect addressing modes.

Address 00h to 1Fh is register area.

Address 20h to 2Fh is memory bit area.

Address 30h to 7Fh is for general memory area.

3.2.2. Data memory - higher 128 byte (80h to FFh)

The address 80h to FFh can be accessed by indirect addressing mode.

Address 80h to FFh is data area.

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M067

Ver B SM39R08A5 04/22/2013

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