User's Manual

ManualsBrandsSonic Alert ManualsClock RadioSonic Alert msm80c154s

MSM80C154S/83C154S/85C154HVS

122

SBUF (R)

INPUT SHIFT REG.

INTERNAL BUS

RI

SBUF (T)

START

START

INTERNAL BUS

TI

RXD

SAMPLE

LOGIC

1/16

COUTER

TXD

RXD

WRITE

TO SBUF

SERIAL PORT

INTERRUPT

REN

SM2

RECEIVE DATA

NEGLECT LOGIC

SERR

BAUD RATE

CLOCK

RCLK

RCLK=1

RCLK=0

1/16

COUTER

BAUD RATE

CLOCK

TCLK

TCLK=1

TCLK=0

TIMER/COUNTER2

OVERFLOW

SMOD

SMOD=1

SMOD=0

1/2

TIMER/COUNTER1

OVERFLOW

Figure 4-35 Serial port (mode 3)