Renesas 4513 Informacje Techniczne Pobierz pdf (Strona 39)

4513/4514 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

(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

SCK

SOUT

SIN

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

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)

(Bit 3)

(Bit 0)

✕✕

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)

✕✕✕

Serial I/O interrupt enable bit

(SNZSI instruction is valid)

Interrupt control register V2

Serial I/O port

CK,SOUT,SIN

External clock selected as

a synchronous clock

Serial I/O mode register J1

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 98 99

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