
HYUNDAI MicroElectronics
30
Serial I/O Mode Register
This register controls serial I/O function. According to SCK1 and SCK0, the internal clock or
external clock can be selected.
Serial I/O Data Register
The Serial I/O Data Register (SIOR) is a 8-bit shift register. First LSB is send or is received.
<00EB
H
>
SIOR
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
At transmittion
Sending Data at Sending Mode
Receiving Data at Receiving Mode
<00EA
H
>
SIOM
7
6
Srdy
5
SM1
4
SM0
3
SCK1
2
SCK0
1
SIOST
0
SIOSF
R/W
R/W
R/W
R/W
R/W
R/W
R
Serial Transmission Clock Selection
00 : PS3 ( 1
)
01 : PS4 ( 2
)
10 : PS5 ( 4
)
11 : External Clock
Serial Operation Mode
00 : Normal Port(R52,R51,R50)
01 : Sending Mode(Sclk,Sout,R50)
10 : Receiving Mode(Sclk,R51,Sin)
11 : Sending & Receiving
M d (S lk S Si )
Serial Transmission Start
0 : Invalid
1 : Start(After one SCK, becomes”0”)
Serial Transmission Status Flag
0 : during transmission
1 : finished
R53/Srdy Selection
0 : R53
1 : Srdy