Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 141)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 9-5

Figure 9-2. USART Mode 1

DIVIDE

BY 4

D7

D6

D5

D4

D3

D2

D1

D0

01

LOAD

CLOCK

TRANSMIT SHIFT REGISTER

S0

LATCH

RECEIVE DATA BUFFER WR

SBUF

RD

D7

D6

D5

D4

D3

D2

D1

D0

CLOCK

RECEIVE SHIFT REGISTER

SI

RESET

BAUD

CLOCK

LOAD

SERIAL

BUFFER

LOAD

SERIAL I/O

CONTROL

INTS

SHIFT

READ

SERIAL

BUFFER

TI

FLAG =

SCON.1

RI

FLAG =

SCON.0

DIVIDE

BY 16

LDSBUF

RDSBUF

0 1

SBUF

SMOD

RXD

PIN

SYSTEM

CLOCK

D0 D1 D2 D3 D4 D5 D6 D7

D0 D1 D2 D3 D4 D5 D6

D7

DIVIDE

BY 16

BIT

DETECTION

TXD

PIN

RB8 =

SCON.2

BAUD-CLOCK

GENERATOR

START

STOP

START

START

SERIAL

INTERRUPT

DATA BUS

RECEIVE TIMING

BIT DETECTOR

SAMPLING

SHIFT

RI

RXD

STOPSTART

TRANSMIT TIMING

LDSBUF

SHIFT

TI

TXD

STOPSTART

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