SC16C754 Datasheet, PDF (20/49 Pages) NXP Semiconductors – Quad UART with 64-byte FIFO

Philips Semiconductors
SC16C754
Quad UART with 64-byte FIFO
X1
1.8432 MHz
C1
47 pF
C2
100 pF
Fig 13. Crystal oscillator connection.
1.5 kΩ
X1
1.8432 MHz
C1
22 pF
C2
47 pF
002aaa169
7. Register descriptions
Each register is selected using address lines A0, A1, A2, and in some cases, bits
from other registers. The programming combinations for register selection are shown
in Table 9.
Table 9:
A2 A1
00
00
01
01
10
10
11
11
00
00
01
10
10
11
11
11
11
11
Register map - read/write properties
A0 Read mode
Write mode
0 receive holding register (RHR)
transmit holding register (THR)
1 interrupt enable register (IER)
interrupt enable register
0 interrupt identification register (IIR)
FIFO control register (FCR)
1 line control register (LCR)
line control register
0 modem control register (MCR)^[1]
modem control register^[1]
1 line status register (LSR)
0 modem status register (MSR)
1 scratchpad register (SPR)
scratchpad register
0 divisor latch LSB (DLL)^{[2], [3]}
divisor latch LSB^{[2], [3]}
1 divisor latch MSB (DLH)^{[2], [3]}
divisor latch MSB^{[2], [3]}
0 enhanced feature register (EFR)^{[2], [4]} enhanced feature register^{[2], [4]}
0 Xon1 word^{[2], [4]}
Xon1 word^{[2], [4]}
1 Xon2 word^{[2], [4]}
Xon2 word^{[2], [4]}
0 Xoff1 word^{[2], [4]}
Xoff1 word^{[2], [4]}
1 Xoff2 word^{[2], [4]}
Xoff2 word^{[2], [4]}
0 transmission control register (TCR)^{[2], [5]} transmission control register^{[2], [5]}
1 trigger level register (TLR)^{[2], [5]}
trigger level register^{[2], [5]}
1 FIFO ready register^{[2], [6]}
[1] MCR[7] can only be modified when EFR[4] is set.
[2] Accessed by a combination of address pins and register bits.
[3] Accessible only when LCR[7] is logic 1.
[4] Accessible only when LCR is set to 10111111 (xBF).
[5] Accessible only when EFR[4] = 1 and MCR[6] = 1, i.e., EFR[4] and MCR[6] are read/write enables.
[6] Accessible only when CSA - CSD = 0, MCR[2] = 1, and loop-back is disabled (MCR[4] = 0).
9397 750 11618
Product data
Rev. 04 — 19 June 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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