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

Timer 1

Overflow

80C51 Internal Bus

TB8

Write

÷2

to

SMOD = 0

SMOD = 1

SBUF

DS Q

SBUF

CL

TxD

Zero Detector

Serial

Port

Interrupt

÷ 16

Sample

1-to-0

Transition

Detector

RxD

Start

TX Clock

Shift

TX Control

T1

Data

Send

÷ 16

RX Clock R1

Start

RX Control

Load

SBUF

Shift

1FFH

Bit Detector

Load

SBUF

Input Shift Register

(9 Bits)

Shift

SBUF

Read

SBUF

TX

Clock

Data

Shift

Write to SBUF

Send

S1P1

TxD

Start Bit

D0

D1

D2

D3

TI

Stop Bit Gen.

RX

Clock

÷ 16 Reset

RxD

Bit Detector

Sample Times

Start

Bit

D0

D1

D2

D3

Shift

RI

80C51 Internal Bus

D4

D5

D6

D7

TB8

D4

D5

D6

D7

RB8

Stop Bit

Stop Bit

Figure 17. Serial Port Mode 3

2002 Jun 06

27

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