SC16C2550 Philips Semiconductors, SC16C2550 Datasheet - Page 16

• Manufacturer Part Number: SC16C2550
• Description: Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
7. Register descriptions
Table 7:
Shaded bits are only accessible when EFR[4] is set.
[1]
[2]
[3]
[4]
9397 750 11621
Product data
A2
General Register Set
0
0
0
0
0
0
1
1
1
1
Special Register Set
0
0
Enhanced Register Set
0
1
1
1
1
The value shown in represents the register’s initialized HEX value; X = n/a.
Accessible only when LCR[7] is logic 0.
Baud rate registers accessible only when LCR[7] is logic 1.
Enhanced Feature Register, Xon-1,2 and Xoff-1,2 are accessible only when LCR is set to ‘BF
A1
0
0
0
1
1
1
0
0
1
1
0
0
1
0
0
1
1
A0
0
0
1
0
0
1
0
1
0
1
0
1
0
0
1
0
1
SC16C2550 internal registers
Register Default
RHR
THR
IER
FCR
ISR
LCR
MCR
LSR
MSR
SPR
DLL
DLM
EFR
Xon-1
Xon-2
Xoff-1
Xoff-2
[3]
[2]
[4]
XX
XX
00
00
01
00
00
60
X0
FF
XX
XX
00
00
00
00
00
Table 7
assigned bit functions are more fully defined in
[1]
details the assigned bit functions for the SC16C2550 internal registers. The
Bit 7
bit 7
bit 7
CTS
interrupt
RCVR
trigger
(MSB)
FIFOs
enabled
divisor
latch
enable
0
FIFO
data
error
CD
bit 7
bit 7
bit 15
Auto
CTS
bit 7
bit 15
bit 7
bit 15
Dual UART with 16 bytes of transmit and receive FIFOs and IrDA
Bit 6
bit 6
bit 6
RTS
interrupt
RCVR
trigger
(LSB)
FIFOs
enabled
set break set parity even
IR
enable
THR and
TSR
empty
RI
bit 6
bit 6
bit 14
Auto
RTS
bit 6
bit 14
bit 6
bit 14
Rev. 03 — 19 June 2003
Bit 5
bit 5
bit 5
Xoff
interrupt
reserved
0
INT
priority
bit 4
0
THR
empty
DSR
bit 5
bit 5
bit 13
Special
char.
select
bit 5
bit 13
bit 5
bit 13
Bit 4
bit 4
bit 4
Sleep
mode
reserved
0
INT
priority
bit 3
parity
loop back OP2/INT
break
interrupt
CTS
bit 4
bit 4
bit 12
Enable
IER[4-7],
ISR[4,5],
FCR[4,5],
MCR[5-7]
bit 4
bit 12
bit 4
bit 12
Section 7.1
Bit 3
bit 3
bit 3
modem
status
interrupt
DMA
mode
select
INT
priority
bit 2
parity
enable
enable
framing
error
bit 3
bit 3
bit 11
Cont-3
Tx, Rx
Control
bit 3
bit 11
bit 3
bit 11
CD
Hex
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
’.
Bit 2
bit 2
bit 2
receive
line
status
interrupt
XMIT
FIFO
reset
INT
priority
bit 1
stop bits word
(OP1)
parity
error
bit 2
bit 2
bit 10
Cont-2
Tx, Rx
Control
bit 2
bit 10
bit 2
bit 10
RI
through
SC16C2550
encoder/decoder
Bit 1
bit 1
bit 1
transmit
holding
register
interrupt
RCVR
FIFO
reset
INT
priority
bit 0
length
bit 1
RTS
overrun
error
bit 1
bit 1
bit 9
Cont-1
Tx, Rx
Control
bit 1
bit 9
bit 1
bit 9
Section
DSR
7.11.
Bit 0
bit 0
bit 0
receive
holding
register
FIFOs
enable
INT
status
word
length
bit 0
DTR
receive
data
ready
bit 0
bit 0
bit 8
Cont-0
Tx, Rx
Control
bit 0
bit 8
bit 0
bit 8
CTS
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