SC16C554BIB64 PHILIPS [NXP Semiconductors], SC16C554BIB64 Datasheet - Page 17

• Manufacturer Part Number: SC16C554BIB64
• Description: 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9397 750 13133
Product data sheet
Fig 8. CTS functional timing waveforms
Fig 9. RTS functional timing waveforms, RCV FIFO trigger level = 1, 4, or 8 bytes
(RD RBR)
CTS
(1) When CTS is LOW, the transmitter keeps sending serial data out.
(2) If CTS goes HIGH before the middle of the last stop bit of the current byte, the transmitter finishes sending the current byte,
(3) When CTS goes from HIGH to LOW, the transmitter begins sending data again.
(1) N = RCV FIFO trigger level (1, 4, or 8 bytes).
(2) The two blocks in dashed lines cover the case where an additional byte is sent as described in the preceding auto-RTS
TX
RTS
IOR
RX
but is does not send the next byte.
section.
6.4.3 Enabling autoflow control and auto-CTS
6.4.4 Auto-CTS and auto-RTS functional timing
Start
Start
Autoflow control is enabled by setting MCR[5] and MCR[1].
Table 7:
The receiver FIFO trigger level can be set to 1, 4, 8, or 14 bytes. These are described in
Figure 9
bits 0 to 7
MCR[5]
1
1
0
byte N
and
Stop
Stop
Enabling autoflow control and auto-CTS
Figure
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs
Start
MCR[1]
1
0
X
10.
1
Rev. 01 — 9 February 2005
Start
byte N + 1
bits 0 to 7
2
Stop
Stop
Selection
auto RTS and CTS
auto CTS
disable
SC16C554B/554DB
N
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
N + 1
Start
Start
bits 0 to 7
byte
002aaa049
Stop
002aaa050
Stop
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