Datasheet

180
4341H–MP3–10/07
AT8xC51SND2C/MP3B
Table 20-7. BDRCON Register
BDRCON (S:92h) – Baud Rate Generator Control Register
Reset Value = XXX0 0000b
Table 20-8. BRL Register
BRL (S:91h) – Baud Rate Generator Reload Register
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
- - - BRR TBCK RBCK SPD M0SRC
Bit Number
Bit
Mnemonic Description
7 - 5 -
Reserved
The value read from these bits are indeterminate. Do not set these bits.
4 BRR
Baud Rate Run Bit
Set to enable the baud rate generator.
Clear to disable the baud rate generator.
3 TBCK
Transmission Baud Rate Selection Bit
Set to select the baud rate generator as transmission baud rate generator.
Clear to select the Timer 1 as transmission baud rate generator.
2 RBCK
Reception Baud Rate Selection Bit
Set to select the baud rate generator as reception baud rate generator.
Clear to select the Timer 1 as reception baud rate generator.
1 SPD
Baud Rate Speed Bit
Set to select high speed baud rate generation.
Clear to select low speed baud rate generation.
0 M0SRC
Mode 0 Baud Rate Source Bit
Set to select the variable baud rate generator in Mode 0.
Clear to select fixed baud rate in Mode 0.
7 6 5 4 3 2 1 0
BRL7 BRL6 BRL5 BRL4 BRL3 BRL2 BRL1 BRL0
Bit Number
Bit
Mnemonic Description
7 - 0 BRL7:0 Baud Rate Reload Value