SC28L92 Philips Semiconductors, SC28L92 Datasheet - Page 35

• Manufacturer Part Number: SC28L92
• Description: 3.3V-5.0V Dual Universal Asynchronous Receiver/Transmitter DUART
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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
2000 Jan 21
3.3V–5.0V Dual Universal Asynchronous
Receiver/Transmitter (DUART)
RESETN
(WRITE)
(READ)
A0–A3
D0–D7
D0–D7
WDN
RDN
CEN
FLOAT
80XXX Mode
t
t
t
AS
CS
RES
t
AH
t
Figure 5. Bus Timing (80XXX mode)
DD
VALID
NOT
t
RW
Figure 4. Reset Timing
t
DS
VALID
VALID
35
t
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.
CH
t
DF
RESETN
t
DH
t
t
RWD
RWD
FLOAT
68XXX Mode
t
RES
SD00087
Product specification
SC28L92
SD00696