ADE5166 datasheet(84/156 Pages) AD

84 / 156 page

ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 84 of 156

MEMORY OVERVIEW

The ADE5166/ADE5169/ADE5566/ADE5569 contain three

memory blocks, as follows:

•

62 kB of on-chip Flash/EE program and data memory

•

256 bytes of general-purpose RAM

•

2 kB of extended internal RAM (XRAM)

The 256 bytes of general-purpose RAM share the upper 128 bytes

of its address space with the SFRs. All of the memory spaces are

shown in Figure 81. The addressing mode specifies which

memory space to access.

General-Purpose RAM

General-purpose RAM resides in Memory Location 0x00

through Memory Location 0xFF. It contains the register banks.

RESET VALUE OF

STACK POINTER

FOUR BANKS OF EIGHT

REGISTERS R0 TO R7

BIT-ADDRESSABLE

(BIT ADDRESSES)

GENERAL-PURPOSE

AREA

BANKS

SELECTED

VIA

BITS IN PSW

0x00

0x08

0x10

0x18

0x20

0x30

0x07

0x0F

0x17

0x1F

0x2F

0x7F

Figure 83. Lower 128 Bytes of Internal Data Memory

Address 0x80 through Address 0xFF of general-purpose RAM

are shared with the SFRs. The mode of addressing determines

which memory space is accessed, as shown in Figure 84.

ACCESSIBLE BY

INDIRECT ADDRESSING

ONLY

ACCESSIBLE BY

DIRECT AND

INDIRECT ADDRESSING

0×FF

GENERAL-PURPOSE RAM

0×00

0×80

0×7F

ACCESSIBLE BY

DIRECT ADDRESSING

ONLY

SPECIFIC FUNCTION REGISTERS (SFRs)

Figure 84. General-Purpose RAM and SFR Memory Address Overlap

Both direct and indirect addressing can be used to access general-

purpose RAM from Address 0x00 through Address 0x7F, but

indirect addressing must be used to access general-purpose

RAM with addresses in the range from 0x80 through 0xFF

because they share the same address space with the SFRs.

The 8052 core also has the means to access individual bits of

certain addresses in the general-purpose RAM and special function

memory spaces. The individual bits of general-purpose RAM,

Address 0x20 to Address 0x2F, can be accessed through Bit

Address 0x00 to Bit Address 0x7F. The benefit of bit addressing is

that the individual bits can be accessed quickly, without the

need for bit masking, which takes more code memory and

execution time. The bit addresses for General-Purpose RAM

Address 0x20 through General-Purpose RAM Address 0x2F

can be seen in Figure 85.

BYTE

ADDRESS

BIT ADDRESSES (HEXA)

0x2F

0x2E

0x2D

0x2C

0x2B

0x2A

0x29

0x28

0x27

0x26

0x25

0x24

0x23

0x22

0x21

0x20

Figure 85. Bit-Addressable Area of General-Purpose RAM

Bit addressing can be used for instructions that involve Boolean

variable manipulation and program branching (see the Instruction

Set section).

Special Function Registers (SFRs)

Special function registers are registers that affect the function

of the 8052 core or its peripherals. These registers are located

in RAM at Address 0x80 through Address 0xFF. They are

accessible only through direct addressing, as shown in Figure 84.

The individual bits of some of the SFRs can be accessed for use

in Boolean and program branching instructions. These SFRs are

labeled as bit addressable, and the bit addresses are given in

Table 15.

Extended Internal RAM (XRAM)

The ADE5166/ADE5169/ADE5566/ADE5569 provide 2 kB of

extended on-chip RAM. No external RAM is supported. This

RAM is located in Address 0x00 through Address 0x7FF in the

extended RAM space. To select the extended RAM memory

space, the extended indirect addressing modes are used.

2kB OF

EXTENDED INTERNAL

RAM (XRAM)

0x7FF

0x00

Figure 86. Extended Internal RAM (XRAM) Space

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