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At89ls53, Special function registers – Rainbow Electronics AT89LS53 User Manual

Page 5

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AT89LS53

4-253

XTAL1
Input to the inverting oscillator amplifier and input to the
internal clock operating circuit.

XTAL2
Output from the inverting oscillator amplifier.

Special Function Registers

A map of the on-chip memory area called the Special Func-
tion Register (SFR) space is shown in Table 1.
Note that not all of the addresses are occupied, and unoc-
cupied addresses may not be implemented on the chip.
Read accesses to these addresses will in general return
random data, and write accesses will have an indeterminate
effect.

Table 1. AT89LS53 SFR Map and Reset Values

0F8H

0FFH

0F0H

B

00000000

0F7H

0E8H

0EFH

0E0H

ACC

00000000

0E7H

0D8H

0DFH

0D0H

PSW

00000000

SPCR

000001XX

0D7H

0C8H

T2CON

00000000

T2MOD

XXXXXX00

RCAP2L

00000000

RCAP2H

00000000

TL2

00000000

TH2

00000000

0CFH

0C0H

0C7H

0B8H

IP

XX000000

0BFH

0B0H

P3

11111111

0B7H

0A8H

IE

0X000000

SPSR

00XXXXXX

0AFH

0A0H

P2

11111111

0A7H

98H

SCON

00000000

SBUF

XXXXXXXX

9FH

90H

P1

11111111

WCON

00000010

97H

88H

TCON

00000000

TMOD

00000000

TL0

00000000

TL1

00000000

TH0

00000000

TH1

00000000

8FH

80H

P0

11111111

SP

00000111

DP0L

00000000

DP0H

00000000

DP1L

00000000

DP1H

00000000

SPDR

XXXXXXXX

PCON

0XXX0000

87H