SPI/Microwire-Compatible

UART in QSOP-16

6

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X1

X2

DOUT

BAUD-RATE

GENERATOR

SPI

INTERFACE

BAUD-RATE

GENERATOR

DIN

SCLK

CS

B0

Pt

TX-SHIFT REGISTER

START/STOP-

BIT DETECT

D0t–D7t

RX-SHIFT REGISTER

D0r–D7r

SHDN

FE

RA

XTAL

B1

B2

B3

RX

TX

9

Pt

TX-BUFFER REGISTER

9

Pr

RA/FE

(MASKS)

Pr

R

T

RX-BUFFER REGISTER

Pr

Pr

RX-BUFFER REGISTER

9

9

I / O

CTS

RTS

IRQ

INTERRUPT

LOGIC

TRANSMIT-DONE (TM)

DATA-RECEIVED (RM)

PARITY (PM)

FRAMING ERROR (RAM)/

RECEIVE ACTIVITY

(SOURCES)

ACTIVITY

DETECT

Figure 2. Functional Diagram