at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 109

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

92
AT89C51RE2
Table 73. BDRCON_1 Register
BDRCON - Baud Rate Control Register (BCh)
Reset Value = 0000 0000b
Not bit addressablef
SMOD1_1
Number
Bit
7
7
6
5
4
3
2
1
0
SMOD0_1
Mnemonic
SMOD1_1
SMOD0_1
RBCK_1
TBCK_1
BRR_1
SPD_1
SRC_1
Bit
6
-
Description
Serial port Mode bit 1 for UART 1
Set to select double baud rate in mode 1, 2 or 3.
Serial port Mode bit 0 for UART 1
Cleared to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Baud Rate Run Control bit
Cleared to stop the internal Baud Rate Generator.
Set to start the internal Baud Rate Generator.
Transmission Baud rate Generator Selection bit for UART 1
Cleared to select Timer 1 or Timer 2 for the Baud Rate Generator.
Set to select internal Baud Rate Generator.
Reception Baud Rate Generator Selection bit for UART 1
Cleared to select Timer 1 or Timer 2 for the Baud Rate Generator.
Set to select internal Baud Rate Generator.
Baud Rate Speed Control bit for UART 1
Cleared to select the SLOW Baud Rate Generator.
Set to select the FAST Baud Rate Generator.
Baud Rate Source select bit in Mode 0 for UART 1
Cleared to select F
mode).
Set to select the internal Baud Rate Generator for UARTs in mode 0.
5
-
BRR_1
4
OSC
/12 as the Baud Rate Generator (F
TBCK_1
3
RBCK_1
2
SPD_1
CLK PERIPH
1
7663B–8051–03/07
/6 in X2
SRC_1
0