ADE7166 datasheet(77/148 Pages) AD

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Preliminary Technical Data

ADE75xx/ADE71xx

Rev. PrE | Page 77 of 148

Figure 57: 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 Special Function

Registers (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 addresses 0x20 through 0x2F can be accessed

through their bit addresses 0x00 through 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 addresses 0x20 through 0x2F can be seen in

Figure 58.

0x20 07 06 05 04 03 02 01 00

0F 0E 0D 0C 0B 0A 09 08

17 16 15 14 13 12 11 10

1F 1E 1D 1C 1B 1A 19 18

27 26 25 24 23 22 21 20

2F 2E 2D 2C 2B 2A 29 28

37 36 35 34 33 32 31 30

3F 3E 3D 3C 3B 3A 39 38

47 46 45 44 43 42 41 40

4F 4E 4D 4C 4B 4A 49 48

57 56 55 54 53 52 51 50

5F 5E 5D 5C 5B 5A 59 58

67 66 65 64 63 62 61 60

6F 6E 6D 6C 6B 6A 69 68

77 76 75 74 73 72 71 70

7F 7E 7D 7C 7B 7A 79 78

0x21

0x22

0x23

0x24

0x25

0x26

0x27

0x28

0x29

0x2A

0x2B

0x2C

0x2D

0x2E

0x2F

Byte Address

Bit Addresses (hexa)

Figure 58: 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.

Special Function Registers:

Special Function Registers are

registers that affect the function of the 8051 core or its

peripherals. These registers are located in RAM with addresses

0x80 through 0xFF. They are only accessible through direct

addressing as shown in Figure 57 .

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 the

SFR Mapping.

Extended Internal RAM (XRAM):

The ADE75XX/ADE71XX

provides 256 bytes of extended on-chip RAM. No external

RAM is supported. This RAM is located in addresses 0x0000

through 0x00FF in the Extended RAM space. To select the

Extended RAM memory space, the extended indirect

addressing modes are used. The internal XRAM is enabled in

the Configuration SFR (CFG, 0xAF) by writing 01 to CFG[1:0].

256 BYTES OF

EXTENDED INTERNAL

RAM (XRAM)

00h

FFh

Figure 59: Extended Internal RAM (XRAM) Space

Code Memory:

Code and data memory are stored in the

16kbyte 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 will interpret the

memory location or data value specified in assembly language

code. There are six addressing modes as shown in Table 60:

Table 60. 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

Immediate Addressing:

In Immediate Addressing, the

expression entered after the number sign (#) will be evaluated

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