Rainbow-electronics AT89LP214 Instrukcja Użytkownika Pobierz pdf (Strona 44)

44

3538A–MICRO–7/06

AT89LP213/214 [Preliminary]

Figure 17-2. Serial Port Mode 1

TX

CLOCK

WRITE TO SBUF

INTERNAL BUS

READ

SBUF

LOAD

SBUF

SBUF

SHIFT

INPUT SHIFT REG.

(9 BITS)

BIT

DETECTOR

1-TO-0

TRANSITION

DETECTOR

SERIAL

PORT

INTERRUPT

WRITE

TO

SBUF

÷2

SMOD1

= 0

SMOD1

= 1

TIMER 1

OVERFLOW

RXD

RX CLOCK

RX CLOCK

RX CONTROL

START

START

DATA

SEND

SAMPLE

÷16

÷16

TX CONTROL

TI

TI

ZERO DETECTOR

SBUF

TXD

INTERNAL BUS

“1”

D

Q

CL

S

LOAD

SBUF

SHIFT

SHIFT

1FFH

RI

SEND

DATA

SHIFT

TXD

TI

D0 D1 D2 D3 D4 D5 D6 D7

D0 D1 D2 D3 D4 D5 D6 D7

STOP BIT

TRANSMIT

START BIT

÷16 RESET

START BIT

STOP BIT

RX

CLOCK

BIT DETECTOR SAMPLE TIMES

SHIFT

RECEIVE

RXD

RI

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 89 90

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