Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 143)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 9-7

9.1.4 USART Mode 3

This mode has the same operation as mode 2, except for the baud rate source. As shown in Figure 9-4, mode 3 gener-

ates baud rates through the baud-clock generator. The bit shifting and protocol are the same.

Figure 9-4. USART Mode 3

D0 D1 D2 D3 D4 D5 D6 D7 RB8 STOP

D0 D1 D2 D3 D4 D5 D6 D7 TB8 STOP

RECEIVE TIMING

TRANSMIT TIMING

BAUD

CLOCK

DIVIDE

BY 4

LOAD

CLOCK

TRANSMIT SHIFT REGISTER

LATCH

RECEIVE DATA BUFFER WR

SBUF

CLOCK

RECEIVE SHIFT REGISTER

RESET

LOAD

SERIAL

BUFFER

LOAD

SERIAL I/O

CONTROL

INTS

SHIFT

READ

SERIAL

BUFFER

FLAG =

SCON.1

FLAG =

SCON.0

DIVIDE

BY 16

LDSBUF

RDSBUF

0 1

SBUF

SMOD

RXD

SYSTEM

CLOCK

DIVIDE

BY 16

BIT

DETECTION

TXD

BAUD-CLOCK

GENERATOR

START

STOP

START

SERIAL

INTERRUPT

DATA BUS

TB8 =

SCON.3

RB8 =

SCON.2

STOP

LDSBUF

SHIFT

TXD

SHIFT

RXD

BIT DETECTOR

SAMPLING

START

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 254 255

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