ADE7166 datasheet(74/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 74 of 148

Table 55. Program Control SFR (PCON, 0x87)

Bit Location

Default

Description

Double baud rate control

6-0

Reserved, should be left cleared

Table 56. Data Pointer Low SFR (DPL, 0x82)

Bits

Default

Description

7-0

Contain the low byte of the data pointer

Table 57. Data Pointer High SFR (DPH, 0x83)

Bits

Default

Description

7-0

Contain the high byte of the data pointer

Table 58. Stack Pointer SFR (SP, 0x81)

Bits

Default

Description

7-0

Contain the 8 LSB of the pointer for the stack

Table 59. Configuration SFR (CFG, 0xAF)

Bit

Location

Bit Mnemonic

Description

Reserved.. This bit should be left set for proper operation.

Enhanced UART enable bit

Standard 8052 UART without enhanced error checking features

EXTEN

Enhanced UART with enhanced error checking—see the UART additional features

section.

Synchronous communication selection bit

I2C port is selected for control of the shared I2C/SPI pins and SFRs

SCPS

SPI port is selected for control of the shared I2C/SPI pins and SFRs

38kHz modulation enable bit

38kHz modulation is disabled.

MOD38EN

38kHz modulation is enabled on the pins selected by the MOD38[7:0] bits in the

EP_CFG SFR.

3-2

Reserved

XREN[1] OR

XREN[0] =1

Enable MOVX instruction to use 256 bytes of Extended RAM.

1-0

XREN[1:0]

XREN[1] AND

XREN[0] =0

Disable MOVX instruction

BASIC 8052 REGISTERS

Program Counter (PC):

The Program Counter holds the two

byte address of the next instruction to be fetched. The PC is

initialized with 0x00 at Reset and is incremented after each

instruction is performed. Note that the amount that is added to

the PC depends on the number of bytes in the instruction, so

the increment can range from one to three bytes. The program

counter is not directly accessible to the user but can be directly

modified by CALL and JMP instructions that change which

part of the program is active.

Instruction Register (IR):

The Instruction Register holds the

opcode of the instruction being executed. The opcode is the

binary code that results from assembling an instruction. This

There are four banks containing 8 byte-wide

registers each, for a total of 32 bytes of registers. These registers

are convenient for temporary storage of mathematical operands.

An instruction involving the accumulator and a register can be

executed in 1 clock cycle as opposed to 2 clock cycles to

perform an instruction involving the accumulator and a literal

or a byte of general purpose RAM. The register banks are

located in the first 32 bytes of RAM.

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