w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 69

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

4.2.9 Bank1.Reg0~1 - Baud Rate Divisor Latch (BLL/BHL)
The two registers of BLL and BHL are baud rate divisor and are the same as for the legacy UART
port. The table below illustrates the use of the baud generator with a frequency of 18,461 Mhz. The
output frequency of the baud generator is the baud rate multiplied by 16. In high-speed UART mode
(relies to Bank 0, Reg 6, Bit 1) the programmable baud generator directly uses 24 Mhz and the same
divisor. In high-speed mode, the baud rate can be as high as 1.5 M bps.
TABLE 3-5 BAUD RATE TABLE
Note 1: Only use in high speed mode, when Bank0.Reg6.Bit1 is set.
** The percentage error for all baud rates, except where indicated otherwise, is 0.16%
Desired Baud Rate
115200
19200
57600
134.5
38400
1.5M
1200
1800
2000
2400
3600
4800
7200
9600
110
150
300
600
50
75
BAUD RATE USING 24 MHZ TO GENERATE 1.8461 MHZ
Decimal divisor used to
generate 16X clock
-60 -
2304
1536
1047
857
768
384
192
1
96
64
58
48
32
24
16
12
6
3
2
1
Note 1
Publication Release Date: March 1999
Percent error difference between
W83977EF/ CTF
desired and actual
PRELIMINARY
0.099%
0.18%
0.53%
0%
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Revision A1