Datasheet

50
AT89C51IC2
4301D–8051–02/08
Table 35. 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 20. Baud Rate selection
Table 36. Baud Rate Selection Table UART
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
TI MER_BRG_RX
Rx Clock
/ 16
0
1
TIMER_BRG_TX
Tx Clock
TBCK
TCLK
TCLK
(T2CON)
RCLK
(T2CON)
TBCK
(BDRCON)
RBCK
(BDRCON)
Clock Source
UART Tx
Clock Source
UART Rx
0 0 0 0 Timer 1 Timer 1
1 0 0 0 Timer 2 Timer 1
0 1 0 0 Timer 1 Timer 2
1 1 0 0 Timer 2 Timer 2
X 0 1 0 INT_BRG Timer 1
X 1 1 0 INT_BRG Timer 2
0 X 0 1 Timer 1 INT_BRG
1 X 0 1 Timer 2 INT_BRG
X X 1 1 INT_BRG INT_BRG