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¡ Semiconductor

MSM64481

Data Memory (RAM)

The data memory space is assigned to RAM and special function registers (SFRs). Data Memory

is located in a different address space from program memory.

The data length is 4 bits (1nibble), and a bank unit is 256 nibbles. The data memory uses two bank

areas: one for the EEPROM and SFR areas, in Bank 0; the other for RAM, including the stack, in

Bank 7.

The following figure shows the address space of data memory.

Data Memory Address Space

7FFh

128 nibbles

780h

700h

0FFh

07Fh

000h

BANK0

4 bits

RAM area

Unused area

Inaccessible area

EEPROM area

SFR area

7FFh

780h

07Fh

07Eh

07Dh

07Ch

000h

Data/stack

area

128 nibbles

Stack

pointer

HALT

MIEF

Other

SFR

area

128 nibbles

BANK7