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S3C8248/C8245/P8245/C8247/C8249/P8249
SIO PRE-SCALER REGISTER (SIOPS)
The control register for serial I/O interface module, SIOPS, is located at F2H in set 1, bank 0.
The value stored in the SIO pre-scale registers, SIOPS, lets you determine the SIO clock rate (baud rate) as
follows:
Baud rate = Input clock (fxx/4)/(Pre-scaler value + 1), or SCK input clock, where the input clock is fxx/4
BLOCK DIAGRAM
SCK
SIOPS (F2H, bank 0)
fxx/2
8-bit P.S.
Prescaler Value = 1/(SIOPS +1)
SI
SIO Pre-scaler Register (SIOPS)
F2H, Set 1, Bank 0 R/W
MSB
.7
.6
.5
Baud rate = (f
Figure 16-2. SIO Pre-scale Registers (SIOPS)
CLK
SIOCON.7
M
U
1/2
X
Figure 16-3. SIO Functional Block Diagram
.4
.3
.2
.1
/4)/(SIOPS + 1)
XX
3-Bit Counter
Clear
SIOCON.3
SIOCON.4
SIOCON.2
(Edge Select)
(Shift Enable)
CLK
8-Bit SIO Shift Buffer
(SIODATA, F1H, bank 0)
8
Data Bus
SERIAL I/O INTERFACE
.0
LSB
SIO INT
SIOCON.0
Pending
SIOCON.1
(Interrupt Enable)
SIOCON.5
(Mode Select)
SIOCON.6
(LSB/MSB First
Mode Select)
IRQ4
SO
16-3
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