ADE8052Z-DWDL1 datasheet(83/144 Pages) AD

部品番号	ADE8052Z-DWDL1

部品情報	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver

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83 / 144 page

ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 83 of 144

Direct Addressing

With direct addressing, the value at the source address is moved

to the destination address. Direct addressing provides the fastest

execution time of all the addressing modes when an instruction

is performed between registers. Note that indirect or direct

addressing modes can be used to access general-purpose RAM

Address 0x00 through Address 0x7F. An instruction with direct

addressing that uses an address between 0x80 and 0xFF is

referring to a special function memory location.

Indirect Addressing

With indirect addressing, the value pointed to by the register is

moved to the destination address. For example, to move the

contents of internal RAM Address 0x82 to the accumulator, use

the following instructions:

MOV

R0,#82h

MOV

A,@R0

These two instructions require a total of four clock cycles and

three bytes of storage in the program memory.

Indirect addressing allows addresses to be computed, which is

useful for indexing into data arrays stored in RAM.

Note that an instruction that refers to Address 0x00 through

Address 0x7F is referring to internal RAM, and indirect or

direct addressing modes can be used. An instruction with

indirect addressing that uses an address between 0x80 and 0xFF

is referring to internal RAM, not to an SFR.

Extended Direct Addressing

The DPTR register (see Table 60) is used to access internal

extended RAM in extended indirect addressing mode. The

ADE7566/ADE7569/ADE7166/ADE7169 have 256 bytes of

XRAM, accessed through MOVX instructions. External memory

spaces are not supported on this device.

In extended direct addressing mode, the DPTR register points

to the address of the byte of extended RAM. The following code

moves the contents of extended RAM Address 0x100 to the

accumulator:

MOV

DPTR,#100h

MOVX

A,@DPTR

These two instructions require a total of seven clock cycles and

four bytes of storage in the program memory.

Extended Indirect Addressing

The internal extended RAM is accessed through a pointer to the

address in indirect addressing mode. The ADE7566/ADE7569/

ADE7166/ADE7169 have 256 bytes of internal extended RAM,

accessed through MOVX instructions. External memory is not

supported on the devices.

In extended indirect addressing mode, a register holds the address

of the byte of extended RAM. The following code moves the

contents of extended RAM Address 0x80 to the accumulator:

MOV

R0,#80h

MOVX

A,@R0

These two instructions require six clock cycles and three bytes

of storage.

Note that there are 256 bytes of extended RAM; therefore, both

extended direct and extended indirect addressing can cover the

whole address range. There is a storage and speed advantage to

using extended indirect addressing because the additional byte

of addressing available through the DPTR register that is not

needed is not stored.

From the three examples demonstrating the access of internal

RAM from 0x80 through 0xFF, and the access of extended

internal RAM from 0x00 through 0xFF, it can be seen that it is

most efficient to use the entire internal RAM accessible through

indirect access before moving to extended RAM.

Code Indirect Addressing

The internal code memory can be accessed indirectly. This can

be useful for implementing lookup tables and other arrays of

constants that are stored in flash. For example, to move the data

stored in flash memory at Address 0x8002 into the accumulator,

use the following code:

MOV

DPTR,#8002h

CLR

A

MOVX

A,@A+DPTR

The accumulator can be used as a variable index into the array

of flash memory located at DPTR.

同様の部品番号 - ADE8052Z-DWDL1

メーカー	部品番号	データシート	部品情報
Analog Devices	ADE8052Z-DWDL1	2Mb / 148P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. 0
Analog Devices	ADE8052Z-DWDL1	2Mb / 156P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B

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同様の説明 - ADE8052Z-DWDL1

メーカー	部品番号	データシート	部品情報
Analog Devices	ADE5166	2Mb / 148P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. 0
	ADE7169F16	1Mb / 140P	Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver Rev. PrD 09/06
	ADE5166	2Mb / 156P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE7116	2Mb / 152P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE7169	2Mb / 152P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE7156	2Mb / 152P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE7166	2Mb / 152P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE7566	2Mb / 152P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE7569	2Mb / 152P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver REV. B
	ADE5166	1Mb / 148P	Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver Rev. PrB

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