5

83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER

4.0 83C51KB MEMORY

Table 3. 83C51KB Memory Map

Code

Memory

Description

Notes

FFFFH

0000H

External code memory

4

0FFFH

0000H

4-Kbyte on-chip code memory array.

Data

Memory

Description

FFFFH

0000H

External data memory

2, 3

00FFH

0080H

Special function registers

1

007FH

0020H

On-chip RAM

5

001FH

0000H

4 banks of general purpose registers, R0-R7

NOTE:

1.

The special function registers (SFRs) are accessible by direct addressing only.

2.

Data in this area is accessible by indirect addressing only.

3.

RD#/WR# active for these external data addresses.

4.

PSEN# active for the external code addresses.

5.

Addresses 20H through 2FH are bit addressable.