Fig. 24 Serial I/O Connection Example - Renesas 4513 User Manual

HARDWARE
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
Master (clock control)
(Bit 0)
(Bit 3)
1
(Bit 3) (Bit 0)
0

Fig. 24 Serial I/O connection example

1-38
D
5
S
CK
S
OUT
S
IN
1 Serial I/O mode register J1
Internal clock selected as
a synchronous clock
Serial I/O port
S S S
CK, OUT, IN
Instruction clock divided by
8 or 4 selected as a transfer
clock
Interrupt control register V2
Serial I/O interrupt enable bit
(SNZSI instruction is valid)
4513/4514 Group User's Manual
wiring between each pin with a resistor. Figure 25 shows the data
transfer timing and Table 13 shows the data transfer sequence.
Slave (external clock)
S signal
RDY
D
5
S
CK
S
IN
S
OUT
(Bit 0)
(Bit 3)
1 0
Serial I/O mode register J1
External clock selected as
a synchronous clock
Serial I/O port
S
This bit is not valid
when J1
(Bit 3) (Bit 0)
0 Interrupt control register V2
Serial I/O interrupt enable bit
(SNZSI instruction is valid)
S S
CK, OUT, IN
="0"
0
: Set an arbitrary value.