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SERIAL I/O INTERFACE KS57C2308/P2308/C2316/P2316
13-6
++ 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 EMB
LD EA,TDATA ; TDATA address = BANK0 (20H–7FH)
LD SBUF,EA
LD EA,#8FH
LD SMOD,EA ; SIO start
EI
BITS IES
•
•
INTS PUSH SB ; Store SMB, SRB
PUSH EA ; Store EA
BITR EMB
LD EA,TDATA ; EA ← Transmit data, TDATA address = BANK0
(20H–7FH)
XCH EA,SBUF ; Transmit data ↔ Receive data
LD RDATA,EA ; RDATA address = BANK0 (20H–7FH)
BITS SMOD.3 ; SIO start
POP EA
POP SB
IRET
KS57C2308/C2316
/ P0.1
SO / P0.2
SI / P0.3
EXTERNAL
DEVICE
SCK