FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 82

• Manufacturer Part Number: FDC37C669_07
• Description: PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support
• Manufacturer: SMSC [SMSC Corporation]

XMITTER are controlled separately, either one
or both can be in the polled mode of operation.
In this mode, the user's program will check
RCVR and XMITTER status via the LSR. LSR
definitions for the FIFO Polled Mode are as
follows:
-
-
BAUD RATE
Bit 0=1 as long as there is one byte in the
RCVR FIFO.
Bits 1 to 4 specify which error(s) have
occurred. Character error status is handled
the same way as when in the interrupt
DESIRED
115200
230400
460800
19200
38400
57600
134.5
1200
1800
2000
2400
3600
4800
7200
9600
110
150
300
600
50
75
GENERATE 16X CLOCK
Table 33 - Baud Rates Using 1.8462 MHz Clock (24 MHz/13)
DIVISOR USED TO
32770
32769
2307
1538
1049
858
769
384
192
96
64
58
48
32
24
16
12
6
3
2
1
BETWEEN DESIRED AND ACTUAL*
82
PERCENT ERROR DIFFERENCE
-
-
-
There is no trigger level reached or timeout
condition indicated in the FIFO Polled Mode,
however, the RCVR and XMIT FIFOs are still
fully capable of holding characters.
mode, the IIR is not affected since EIR bit
2=0.
Bit 5 indicates when the XMIT FIFO is
empty.
Bit 6 indicates that both the XMIT FIFO and
shift register are empty.
Bit 7 indicates whether there are any errors
in the RCVR FIFO.
0.005
0.03
0.03
0.01
0.03
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.16
0.5
1.6
BIT 7 OR 6
CROC:
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
1