Samsung KS57C2308 Manual page 278

SERIAL I/O INTERFACE
+ +
PROGRAMMING TIP — Setting Transmit/Receive Modes for Serial I/O (Continued)
3. Transmit and receive Data through SIO interface using an internal clock frequency of 4.09 kHz (at 4.19 MHz)
in LSB-first mode:
BITR
LD
LD
LD
LD
EI
BITS
INTS PUSH
PUSH
BITR
LD
XCH
LD
BITS
POP
POP
IRET
13-6
EMB
EA,TDATA
SBUF,EA
EA,#8FH
SMOD,EA
IES
SB
EA
EMB
EA,TDATA
EA,SBUF
RDATA,EA
SMOD.3
EA
SB
SCK
/ P0.1
SO / P0.2
SI / P0.3
KS57C2308/C2316
; TDATA address = BANK0 (20H–7FH)
; SIO start
; Store SMB, SRB
; Store EA
; EA Transmit data, TDATA address = BANK0
(20H–7FH)
; Transmit data Receive data
; RDATA address = BANK0 (20H–7FH)
; SIO start
EXTERNAL
DEVICE
KS57C2308/P2308/C2316/P2316