Datasheet

51
4235K–8051–05/08
AT89C51RD2/ED2
14.3 Registers
Table 14-1. SADEN Register
SADEN - Slave Address Mask Register (B9h)
Reset Value = 0000 0000b
Not bit addressable
Table 14-2. SADDR Register
SADDR - Slave Address Register (A9h)
Reset Value = 0000 0000b
Not bit addressable
14.4 Baud Rate Selection for UART for Mode 1 and 3
The Baud Rate Generator for transmit and receive clocks can be selected separately via the
T2CON and BDRCON registers.
Figure 14-4. Baud Rate Selection
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
RCLK
/ 16
RBCK
INT_BRG
0
1
TIMER1
0
1
0
1
TIMER2
INT_BRG
TIMER1
TIMER2
TIMER_BRG_RX
Rx Clock
/ 16
0
1
TIMER_BRG_TX
Tx Clock
TBCK
TCLK