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P87C58UFBB

80C51 8-bit microcontroller family 8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V), low power, high speed (33 MHz)

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),

low power, high speed (33MHz)

Product specification

8XC52/54/58/80C32

8XC51FA/FB/FC/80C51FA

8XC51RA+/RB+/RC+/RD+/80C51RA+

D0

D1

D2

D3

D4

D5

D6

D7

D8

START

BIT

DATA BYTE

ONLY IN STOP

MODE 2, 3 BIT

SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR)

SM0 TO UART MODE CONTROL

SM0 / FE SM1

SM2

REN

TB8

RB8

TI

RI

SCON

(98H)

SMOD1 SMOD0

–

0 : SCON.7 = SM0

1 : SCON.7 = FE

POF

GF1

GF0

PD

Figure 8. UART Framing Error Detection

IDL

PCON

(87H)

SU01191

D0

D1

D2

D3

D4

D5

D6

D7

D8

SM0

SM1

SM2

REN

TB8

RB8

TI

1

1

1

0

1

1

X

RI

SCON

(98H)

RECEIVED ADDRESS D0 TO D7

PROGRAMMED ADDRESS

COMPARATOR

IN UART MODE 2 OR MODE 3 AND SM2 = 1:

INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS”

– WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES

– WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS.

Figure 9. UART Multiprocessor Communication, Automatic Address Recognition

SU00045

1999 Apr 01

21

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