
55
AT89C51ID2
4289C–8051–11/05
Registers
Table 35. SADEN Register
SADEN - Slave Address Mask Register (B9h)
Reset Value = 0000 0000b
Not bit addressable
Table 36. SADDR Register
SADDR - Slave Address Register (A9h)
Reset Value = 0000 0000b
Not bit addressable
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 23. Baud Rate Selection
76
543
210
76
543
210
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