C8051F2XX Datasheet, PDF (123/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
Table 16.2. Oscillator Frequencies for Standard Baud Rates (Continued)
Oscillator Frequency
(MHz)
7.3728
5.5296
3.6864
1.8432
24.576
25.0
25.0
24.576
24.0
23.592
22.1184
18.432
16.5888
14.7456
12.9024
11.0592
9.216
7.3728
5.5296
3.6864
1.8432
Divide Factor
64
48
32
16
320
434
868
848
833
819
768
640
576
512
448
348
320
256
192
128
64
Timer 1 Load Value*
0xFC
0xFD
0xFE
0xFF
0xEC
0xE5
0xCA
0xCB
0xCC
0xCD
0xD0
0xD8
0xDC
0xE0
0xE4
0xE8
0xEC
0xF0
0xF4
0xF8
0xFC
Resulting Baud Rate**
115200
115200
115200
115200
76800
57600 (57870)
28800
28800 (28921)
28800 (28846)
28800 (28911)
28800
28800
28800
28800
28800
28800
28800
28800
28800
28800
28800
SFR Definition 16.1. SBUF: Serial (UART) Data Buffer
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address:
0x99
Bits7–0:
SBUF.[7:0]: Serial Data Buffer Bits 7–0 (MSB-LSB)
This is actually two registers; a transmit and a receive buffer register. When data is moved
to SBUF, it goes to the transmit buffer and is held for serial transmission. Moving a byte to
SBUF is what initiates the transmission. When data is moved from SBUF, it comes from the
receive buffer.
Rev. 1.6
123