DOC4106 datasheet(15/47 Pages) ATMEL

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AT8xC51SND1C

4106F–8051–10/02

Special Function

Registers

The Special Function Registers (SFRs) of the AT8xC51SND1 derivatives fall into the

categories detailed in Table 16 through Table 32. The relative addresses of these SFRs

are provided together with their reset values in Table 33. In this table, the bit-address-

able registers are identified by Note 1.

Table 16. C51CoreSFRs

Mnemonic

Add

Name

ACC

E0h

Accumulator

–

F0h

B Register

–

–––

–

PSW

D0h

Program Status

Word

RS1

RS0

81h

Stack Pointer

–

DPL

82h

Data Pointer Low

byte

–

–––

–

DPH

83h

Data Pointer High

byte

–

–––

–

Table 17. System Management SFRs

Mnemonic

Add

Name

PCON

87h

Power Control

SMOD1

SMOD0

–

GF1

GF0

IDL

AUXR

8Eh

Auxiliary Register 0

–

EXT16

DPHDIS

XRS1

XRS0

EXTRAM

AUXR1

A2h

Auxiliary Register 1

–

ENBOOT

–

GF3

–

DPS

NVERS

FBh

Version Number

NV7

NV6

NV5

NV4

NV3

NV2

NV1

NV0

Table 18. PLL and System Clock SFRs

Mnemonic

Add

Name

CKCON

8Fh

Clock Control

–

PLLCON

E9h

PLL Control

–

PLLRES

–

PLLEN

PLOCK

PLLNDIV

EEh

PLL N Divider

–

PLLRDIV

EFh

PLL R Divider

R8R7R6

R4R3

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