AS8228 datasheet(85/123 Pages) AMSCO

85 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 85 of 123

Memory Maps

The MCU51 is configured as Von Neumann architecture merging program and data range into one 64kB

address space. This space is completely accessible via MOVX and partly accessible via MOVC (0000h –

5FFFh). Besides, there is the typical 8051 structure with 128 bytes of internal memory (I_RAM) and the special

function registers (SFRs) also in a 128 byte address space.

SFRs

Direct addressing

FFh

80h

128 bytes

I_RAM

7Fh

00h

Internal Memory

unused

FFFFh

C000h

IDATA /PS

Memory

Special

Function

Registers

unused

A000h

unused

1kB X_RAM

24kB

P_RAM

5FFFh

0000h

9000h

8000h

6000h

unused

9FFFh

MPIO

LCDD

DSP

SPI

RTC

SCT

9500h

9400h

9300h

9200h

9100h

9000h

Direct addressing

addressing

MOVX A, @DPTR

(4 banks)

MOVX @DPTR, A

Bit addressing

MOVC A, @A+PC

MOVC A, @A+DPTR

} only for 0000h – 5FFFh

MOVX @Ri, A

MOVXA, @Ri with Ri

ε {R0, R1},

P2 represents upper address bits

Program Memory (P_RAM)

The P_RAM shares address and output data lines with the X_RAM. 24kB out of 64kB addressable memory are

used: 0000h – 5FFFh for program storage.

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