Renesas 4514 - Manual (Page 51)

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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
S OUT
S RDY signal
S CK
S IN
D 5
S CK
S OUT
S IN
D 5
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, S OUT, S IN
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 ✕ ✕ 0 1
✕ ✕
✕ ✕
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, S OUT, S IN
External clock selected as
a synchronous clock
Serial I/O mode register J1