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Serial
Port Control ( SCON ) Register
| MSB |
|
LSB |
SM0 |
SM1 |
SM2 |
REN |
TB8 |
RB8 |
TI |
RI |
Where SM0, SM1 specify the serial port mode,
as follows
SM0 |
SM1 |
Mode |
Description |
Baud
Rate |
0 |
0 |
0 |
Shif Register |
fosc/ 12 |
0 |
1 |
1 |
8 bit UART |
variable |
1 |
0 |
2 |
9 bit UART |
fosc/64 fosc/32 |
1 |
1 |
3 |
9 bit UART |
variable |
Note:
| SM2 |
Enables
the multiprocessor communication feature in Modes 2 and 3. In
Mode 2 or 3, if SM2 is set to 1, then Rl will not be activated
if the received 9th data bit (RB8) is 0. In Mode 1, if SM2=1 then
RI will not be activated if a valid stop bit was not received.
In Mode 0, SM2 should be 0. |
| REN |
Enables serial reception.
Set by software to enable reception. Clear by software to disable
reception. |
| TB8 |
The 9th data bit that
will be transmitted in Modes 2 and 3. Set or clear by software
as desired. |
| RB8 |
In Modes 2 and 3, is
the 9th data bit that was received. In Mode 1, it SM2=0, RB8 is
the stop bit that was received. In Mode 0,
RB8 is not used. |
| TI |
Transmit interrupt
flag. Set by hardware at the end of the 8th bit time in Mode 0,
or at the beginning of the stop bit in the other modes, in any
serial transmission. Must be cleared by software. |
| RI |
Receive interrupt flag.
Set by hardware at the end of the 8th bit time in Mode 0, or halfway
through the stop bit time in the other modes, in any serial reception
(except see SM2). Must be cleared by software. |
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Lesson 1:
T
o o l
1.1. Programmer
1.2. Edsim
51
1.3. MIDE-51
1.4. ATMEL
ISP
Lesson 2:
Input Output
2.1.LED
2.2.Swicht
2.3.7
Segmen
2.4.LCD
Character
2.5.ADC
2.6.DAC
2.7.Motor
Stepper
2.8.Keypad
Lesson 3:
Timer Counter
3.1.Basic
3.2.Mode
0
3.3.Mode
1
3.4.Mode
2
3.5.Mode
3
Lesson 4:
Serial Comm.
4.1.Basic
4.2.LED
4.3.Rotate
LED
4.2 ADC
4.3.LCD
Lesson 5:
Interuption
5.1.Basic
5.2.Timer
5.2.External
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