SC16IS762 Philips Semiconductors, SC16IS762 Datasheet - Page 9

• Manufacturer Part Number: SC16IS762
• Description: (SC16IS752 / SC16IS762) Dual UART
• Manufacturer: Philips Semiconductors

NXP Semiconductors
SC16IS752_SC16IS762_6
Product data sheet
Fig 5. RTS functional timing
(1) N = receiver FIFO trigger level.
(2) The two blocks in dashed lines cover the case where an additional character is sent, as described in
receive
FIFO
RTS
read
RX
7.2.1 Auto-RTS
Figure 5
are stored in the TCR. RTS is active if the RX FIFO level is below the halt trigger level in
TCR[3:0]. When the receiver FIFO halt trigger level is reached, RTS is deasserted. The
sending device (for example, another UART) may send an additional character after the
trigger level is reached (assuming the sending UART has another character to send)
because it may not recognize the deassertion of RTS until it has begun sending the
additional character. RTS is automatically reasserted once the receiver FIFO reaches the
resume trigger level programmed via TCR[7:4]. This reassertion allows the sending
device to resume transmission.
start
Fig 4. Auto flow control (Auto-RTS and Auto-CTS) example
character
shows RTS functional timing. The receiver FIFO trigger levels used in Auto-RTS
N
FIFO
FIFO
TX
RX
stop
UART 1
Rev. 06 — 19 December 2006
SERIAL TO
TO SERIAL
PARALLEL
PARALLEL
CONTROL
Dual UART with I
CONTROL
FLOW
FLOW
start
character
N + 1
1
RTS
CTS
RX
TX
2
2
SC16IS752/SC16IS762
C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
stop
TX
CTS
RX
RTS
TO SERIAL
SERIAL TO
PARALLEL
N
PARALLEL
CONTROL
CONTROL
FLOW
FLOW
UART 2
N + 1
Section
© NXP B.V. 2006. All rights reserved.
002aab040
start
7.2.1.
FIFO
FIFO
RX
TX
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