P89C51X2 データシートの表示（PDF） - Philips Electronics

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P89C51X2

8-bit Flash microcontroller family 4K/8K/16K/32K Flash

Philips Electronics 

Philips Semiconductors

80C51 8-bit Flash microcontroller family

4K/8K/16K/32K Flash

Preliminary data

P89C51X2/52X2/54X2/58X2

80C51 Internal Bus

Write

to

SBUF

DS Q

CL

SBUF

Zero Detector

RxD

P3.0 Alt

Output

Function

S6

REN

RI

Serial

Port

Interrupt

Start

TX Clock

TX Control

T1

Shift

Send

RX Clock

Start

R1

Receive

RX Control

Shift

1111111 0

LSB

MSB

Input Shift Register

Shift

Load

SBUF

Shift

Clock

RxD

P3.0 Alt

Input

Function

TxD

P3.1 Alt

Output

Function

LSB

SBUF

MSB

Read

SBUF

80C51 Internal Bus

S4 . . S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1 . . . . S6 S1

ALE

Send

Shift

Write to SBUF

S6P2

RxD (Data Out)

TxD (Shift Clock)

TI

D0

D1

D2

D3

S3P1

S6P1

D4

D5

D6

D7

Write to SCON (Clear RI)

RI

Receive

Shift

RxD (Data In)

TxD (Shift Clock)

D0

D1

D2

D3

D4

D5

D6

D7

S5P2

Figure 14. Serial Port Mode 0

Transmit

Receive

SU00539

2002 Jun 06

24

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