Datasheet

145
AT8xC51SND1C
4109E–8051–06/03
Table 129. BDRCON Register
BDRCON (S:92h) – Baud Rate Generator Control Register
Reset Value = XXX0 0000b
Table 130. BRL Register
BRL (S:91h) – Baud Rate Generator Reload Register
Reset Value = 0000 0000b
76543210
- - - 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.
4BRR
Baud Rate Run Bit
Set to enable the baud rate generator.
Clear to disable the baud rate generator.
3TBCK
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.
2RBCK
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.
0M0SRC
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.
76543210
BRL7 BRL6 BRL5 BRL4 BRL3 BRL2 BRL1 BRL0
Bit
Number
Bit
Mnemonic Description
7 - 0 BRL7:0 Baud Rate Reload Value