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S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X SERIAL I/O INTERFACE
14-3
SIO PRE-SCALER REGISTER (SIOPS)
The prescaler register for serial I/O interface module, SIOPS, is located at E3H in set 1, bank 0.
The value stored in the SIO pre-scaler register, SIOPS, lets you determine the SIO clock rate (baud rate) as
follows:
Baud rate = Input clock (fxx/4)/(Prescaler value + 1), or SCK input clock.
SIO Pre-scaler Register (SIOPS)
E3H, Set 1, Bank 0, R/W
.7 .6 .5 .4 .3 .2 .1 .0MSB LSB
Baud rate = (f
XX
/4)/(SIOPS + 1)
Figure 14-2. SIO Prescaler Register (SIOPS)
SIO BLOCK DIAGRAM
SIO INT
Pending
3-Bit Counter
Clear
SIOCON.0
fxx/2
SIOPS (E3H, set 1, bank 0)
SCK
SIOCON.7
SIOCON.1
(Interrupt Enable)
CLK
SI
SIOCON.3
Data Bus
SO
M
U
X
1/28-bit P.S.
8
8-Bit SIO Shift Buffer
(SIODATA, E2H, set 1, bank 0)
CLK
SIOCON.4
(Edge Select)
SIOCON.5
(Mode Select)
SIOCON.2
(Shift Enable)
SIOCON.6
(LSB/MSB First
Mode Select)
Figure 14-3. SIO Functional Block Diagram