P89LPC920 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

P89LPC920

8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM

Philips Electronics 

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Table 4: Special function registers

* indicates SFRs that are bit addressable.

Name

Description

SFR Bit functions and addresses

addr. MSB

LSB

Reset value

Hex Binary

Bit address E7

E6

E5

E4

E3

E2

E1

E0

ACC*

Accumulator

E0H

00

00000000

AUXR1 Auxiliary function register

A2H CLKLP EBRR ENT1 ENT0 SRST

0

-

DPS 00[1] 000000x0

Bit address F7

F6

F5

F4

F3

F2

F1

F0

B*

B register

F0H

00

00000000

BRGR0[2] Baud rate generator rate

LOW

BEH

00

00000000

BRGR1[2] Baud rate generator rate

HIGH

BFH

00

00000000

BRGCON Baud rate generator control BDH

-

-

-

-

-

-

SBRGS BRGEN 00

xxxxxx00

CMP1

Comparator 1 control register ACH

-

-

CE1

CP1

CN1

OE1

CO1

CMF1 00[1] xx000000

CMP2

Comparator 2 control register ADH

-

-

CE2

CP2

CN2

OE2

CO2

CMF2 00[1] xx000000

DIVM

CPU clock divide-by-M

95H

control

00

00000000

DPTR

Data pointer (2 bytes)

DPH Data pointer HIGH

83H

00

00000000

DPL Data pointer LOW

82H

00

00000000

FMADRH Program Flash address HIGH E7H

00

00000000

FMADRL Program Flash address LOW E6H

00

00000000

FMCON Program Flash control (Read) E4H BUSY

-

-

-

HVA

HVE

SV

OI 70

01110000

Program Flash control (Write) E4H FMCMD. FMCMD. FMCMD. FMCMD. FMCMD. FMCMD. FMCMD. FMCMD.

7

6

5

4

3

2

1

0

FMDATA Program Flash data

E5H

00

00000000

I2ADR

I2C slave address register

DBH I2ADR.6 I2ADR.5 I2ADR.4 I2ADR.3 I2ADR.2 I2ADR.1 I2ADR.0 GC 00

00000000

Bit address DF

DE

DD

DC

DB

DA

D9

D8

I2CON* I2C control register

D8H

-

I2EN

STA

STO

SI

AA

-

CRSEL 00

x00000x0

I2DAT

I2C data register

DAH

I2SCLH

Serial clock generator/SCL

duty cycle register HIGH

DDH

00

00000000

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