ADE7166_15 datasheet(86/152 Pages) AD

86 / 152 page

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

Rev. B | Page 86 of

152

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.

GENERAL-PURPOSE RAM

SPECIAL FUNCTION REGISTERS (SFRs)

ACCESSIBLE BY

INDIRECT ADDRESSING

ONLY

ACCESSIBLE BY

DIRECT AND INDIRECT

ADDRESSING

ACCESSIBLE BY

DIRECT ADDRESSING

ONLY

0xFF

0x80

0x7F

0x00

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

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

purpose RAM from 0x00 through 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 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 ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 provide 256 bytes of extended on-chip RAM. No

external RAM is supported. This RAM is located in Address

0x00 through Address 0xFF in the extended RAM space. To

select the extended RAM memory space, the extended indirect

addressing modes are used.

256 BYTES OF

EXTENDED INTERNAL

RAM (XRAM)

0x00FF

0x0000

Figure 86. Extended Internal RAM (XRAM) Space

Code Memory

Code and data memory is stored in the 16 kB flash memory

space. No external code memory is supported. To access code

memory, code indirect addressing is used.

ADDRESSING MODES

The 8052 core provides several addressing modes. The

addressing mode determines how the core interprets the

memory location or data value specified in assembly language

code. There are six addressing modes, as shown in Table 64.

Table 64. 8052 Addressing Modes

Addressing Mode

Example

Bytes

Core Clock

Cycles

Immediate

MOV A,#A8h

MOV DPTR,#A8h

Direct

MOV A, A8h

MOV A, IE

MOV A, R0

Indirect

MOV A, @R0

Extended Direct

MOVX A, @DPTR

Extended Indirect

MOVX A, @R0

Code Indirect

MOVC A, @A+DPTR

MOVC A, @A+PC

JMP @A+ DPTR

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