参数资料
型号: 37C669
厂商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 146/164页
文件大小: 621K
代理商: 37C669
82
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:
-
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
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.
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.
Table 33 - Baud Rates Using 1.8462 MHz Clock (24 MHz/13)
DESIRED
BAUD RATE
DIVISOR USED TO
GENERATE 16X CLOCK
PERCENT ERROR DIFFERENCE
BETWEEN DESIRED AND ACTUAL*
CROC:
BIT 7 OR 6
50
2307
0.03
X
75
1538
0.03
X
110
1049
0.005
X
134.5
858
0.01
X
150
769
0.03
X
300
384
0.16
X
600
192
0.16
X
1200
96
0.16
X
1800
64
0.16
X
2000
58
0.5
X
2400
48
0.16
X
3600
32
0.16
X
4800
24
0.16
X
7200
16
0.16
X
9600
12
0.16
X
19200
6
0.16
X
38400
3
0.16
X
57600
2
1.6
X
115200
1
0.16
X
230400
32770
0.16
1
460800
32769
0.16
1
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