GM82C803CN Datasheet, PDF (66/84 Pages) List of Unclassifed Manufacturers – 2.88 MB FDC/ Dual UARTs with FIFO/PIO(EPP/ ECP)/ IDE Interface/ S-IR/ PnP

GM82C803CN
Table 4-33. Divisors, Baud Rates and Clock Frequencies
Divisor
Baud Rate
50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200
38400
56000
115200
230400
460800
(24 13) MHz clock
Decimal Divisor
for 16 Clock
Percent Error
2304
1536
1047
857
768
384
192
96
64
58
48
32
24
16
12
6
3
2
1
32770
32769
0.001
0.004
0.005
0.030
0.16
0.16
0.16
InfraRed Interface
The GM82C803CN has faculty of infrared interface. The IR interface provides a two-way wireless communication
port using infrared. In GM82C803CN, two ways of IR implementation (Amplitude Shift Keyed IR, IrDA) are
provided.
IrDA supports up to 115K Baud rate in serial communication. Each word is sent serially beginning with a zero value
start bit. ??is signaled by sending a single IR pulse, while ??is signaled by sending no IR pulse during the bit time.
The Amplitude Shift Keyed IR has baud rate up to 19.2Kbps. Each word is sent serially beginning with a zero value
start bit. ??is signaled by sending a 500KHz pulse during the serial bit time, while ??is signaled by sending no
transmission during the bit time.
If the Half Duplex option is chosen, there is a time interval while the direction of the transmission is changed. The
interval timer starts after the last bit is transferred during a transmission and blocks the receiver input until the interval
elapses. If a datum is loaded in transmitter fifo before the interval elapses, the timer is cleared. If a datum is loaded
into the transmit buffer while a character is received, the transmission will not start for the interval after the last
receive bit is received. If the start bit of another character is received during this time interval, the timer is cleared. The
time-interval is four character times. One character time is defined as a 10 bit time regardless of the actual word
length.