SC28L92 datasheet(35/44 Pages) PHILIPS

35 / 44 page

Philips Semiconductors

Product specification

SC28L92

3.3V–5.0V Dual Universal Asynchronous

Receiver/Transmitter (DUART)

2000 Jan 21

thus, called RTSAN for RxA and RTSBN for RxB. RTSAN is on pin

OP0 and RTSBN is on OP1. A receiver’s RTS output will usually be

connected to the CTS input of the associated transmitter. Therefore,

one could say that RTS and CTS are different ends of the same

wire!

MR2(4) is the bit that allows the transmitter to be controlled by the

CTS pin (IP0 or IP1). When this bit is set to one AND the CTS input

is driven high, the transmitter will stop sending data at the end of the

present character being serialized. It is usually the RTS output of

the receiver that will be connected to the transmitter’s CTS input.

The receiver will set RTS high when the receiver FIFO is full AND

the start bit of the ninth or 17th character is sensed. Transmission

then stops with nine or 17 valid characters in the receiver. When

MR2(4) is set to one, CTSN must be at zero for the transmitter to

operate. If MR2(4) is set to zero, the IP pin will have no effect on

the operation of the transmitter. MR1(7) is the bit that allows the

receiver to control OP0. When OP0 (or OP1) is controlled by the

receiver, the meaning of that pin will be.

RESETN

tRES

SD00696

RESETN

tRES

80XXX Mode

68XXX Mode

Figure 4. Reset Timing

A0–A3

CEN

tAS

tCS

tCH

RDN

tRW

tRWD

D0–D7

(READ)

tDD

tDF

FLOAT

VALID

NOT

VALID

WDN

tRWD

VALID

D0–D7

(WRITE)

tDS

tDH

tAH

SD00087

Figure 5. Bus Timing (80XXX mode)

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