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[1]

Extended SFRs are physically located on-chip but logically located in external data memory address space (XDATA). The MOVX A,@DPTR and MOVX @DPTR,A instructions are

used to access these extended SFRs.

[2]

The BOICFG1/0 will be copied from UCFG1.5 and UCFG1.3 when power-on reset.

[3]

CLKCON register reset value comes from UCFG1 and UCFG2. The reset value of CLKCON.2 to CLKCON.0 come from UCFG1.2 to UCFG1.0 and reset value of CLKDBL bit

comes from UCFG2.7.

Table 5.

Extended special function registers[1]

Name

Description

SFR

addr.

Bit functions and addresses

Reset value

MSB

LSB

Hex

Binary

BODCFG

BOD

configuration

register

FFC8H

----

-

-

BOICFG1 BOICFG0 [2]

CLKCON

CLOCK Control

register

FFDEH

CLKOK

-

-

XTALWD

CLKDBL

FOSC2

FOSC1

FOSC0

[3]

RTCDATH

Real-time clock

data register

high

FFBFH

00

0000 0000

RTCDATL

Real-time clock

data register low

FFBEH

00

0000 0000