4513_03 Datasheet, PDF (51/210 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCOMPUTER

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
wiring between each pin with a resistor. Figure 25 shows the data
transfer timing and Table 13 shows the data transfer sequence.
Master (clock control)
Slave (external clock)
D5
SCK
SOUT
SIN
SRDY signal
D5
SCK
SIN
SOUT
(Bit 3)
(Bit 0)
! ! ^{1 1 Serial I/O mode register J1}
(Bit 3)
0_!
Internal clock selected as
a synchronous clock
Serial I/O port
SCK,SOUT,SIN
Instruction clock divided by
8 or 4 selected as a transfer
clock
(Bit 0)
! ! ^{Interrupt control register V2}
(Bit 3)
(Bit 0)
! ! 1 0 Serial I/O mode register J1
External clock selected as
a synchronous clock
Serial I/O port
SCK,SOUT,SIN
This bit is not valid
when J10=“0”
(Bit 3)
(Bit 0)
0 ! ! ! Interrupt control register V2
Serial I/O interrupt enable bit
(SNZSI instruction is valid)
Serial I/O interrupt enable bit
(SNZSI instruction is valid)
Fig. 24 Serial I/O connection example
! : Set an arbitrary value.
1-38
4513/4514 Group User’s Manual