Samsung C8274X Manuel D’Utilisation

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

.0

MSB

LSB

Baud rate = (f

XX

/4)/(SIOPS + 1)

 

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

1/2

8-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)