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HARDWARE
4513/4514 Group User’s Manual
FUNCTION BLOCK OPERATIONS
(5) How to use serial I/O
Figure 24 shows the serial I/O connection example. Serial I/O inter-
rupt is not used in this example. In the actual wiring, pull up the
wiring between each pin with a resistor. Figure 25 shows the data
transfer timing and Table 13 shows the data transfer sequence.
Fig. 24 Serial I/O connection example
SOUT
SRDY signal
SCK
SIN
D5
SCK
SOUT
SIN
D5
Master (clock control)
Serial I/O interrupt enable bit
(SNZSI instruction is valid)
Interrupt control register V2
Serial I/O mode register J1
Serial I/O port
S
CK,SOUT,SIN
Instruction clock divided by
8 or 4 selected as a transfer
clock
Internal clock selected as
a synchronous clock
Slave (external clock)
✕
0
1
(Bit 3)
(Bit 0)
1
✕✕
01
✕✕
✕✕
This bit is not valid
when J1
0=“0”
✕ : Set an arbitrary value.
(Bit 3) (Bit 0) (Bit 3) (Bit 0)
(Bit 3)
(Bit 0)
0
✕✕✕
Serial I/O interrupt enable bit
(SNZSI instruction is valid)
Interrupt control register V2
Serial I/O port
S
CK,SOUT,SIN
External clock selected as
a synchronous clock
Serial I/O mode register J1