GMS81508A Datasheet, PDF (35/91 Pages) Hynix Semiconductor – USERS MANUAL

HYUNDAI MicroElectronics

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.
SIOM
<00EA_H>


R/W R/W R/W R/W R/W R/W
R
7
6
5
4
3
2
1
0

Srdy SM1 SM0 SCK1 SCK0 SIOST SIOSF
R53/Srdy Selection
0 : R53
1 : Srdy
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 Status Flag
0 : during transmission
1 : finished
Serial Transmission Start
0 : Invalid
1 : Start(After one SCK, becomes”0”)
Serial Transmission Clock Selection
 00 : PS3 ( 1 )
 01 : PS4 ( 2 )
 10 : PS5 ( 4 )
11 : External Clock

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.
SIOR
<00EB_H>
R/W R/W R/W R/W R/W R/W R/W R/W
7
6
5
4
3
2
1
0
D7 D6 D5 D4 D3 D2 D1 D0
At transmittion
Sending Data at Sending Mode
Receiving Data at Receiving Mode
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