ADE5166 datasheet(78/148 Pages) AD

78 / 148 page

ADE5166/ADE5169/ADE5566/ADE5569

Preliminary Technical Data

Rev. PrB | Page 78 of 148

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 61. Lower 128 Bytes of Internal Data Memory

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

are shared with the special function registers. The mode of

addressing determines which memory space is accessed, as

shown in Figure 62.

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 62. 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, 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 63.

BYTE

ADDRESS

BIT ADDRESSES (HEXA)

0x2F

0x2E

0x2D

0x2C

0x2B

0x2A

0x29

0x28

0x27

0x26

0x25

0x24

0x23

0x22

0x21

0x20

Figure 63. 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

Special function registers are registers that affect the function of

the 8051 core or its peripherals. These registers are located in

RAM with Address 0x80 through Address 0xFF. They are only

accessible through direct addressing, as shown in Figure 62.

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 14.

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 64: Extended Internal RAM (XRAM) Space

Code Memory

Code and data memory are stored in the 62 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 address-

ing 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 66.

ADE5166 数据表(PDF) 78 Page - Analog Devices

ADE5166 数据表(HTML) 78 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

ADE5166 数据表(PDF) 78 Page - Analog Devices

ADE5166 数据表(HTML) 78 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载