4513 datasheet(145/210 Pages) RENESAS

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APPLICATION

2.4 Serial I/O

2-42

4513/4514 Group User’s Manual

2.4.3 Operation description

Figure 2.4.2 shows the serial I/O connection example, Figure 2.4.3 shows the serial I/O register state, and

Figure 2.4.4 shows the serial I/O transfer timing.

Fig. 2.4.2 Serial I/O connection example

Fig. 2.4.3 Serial I/O register state when transmitting/receiving

S7 S6 S5 S4 S3 S2 S1 S0

M7 M6 M5 M4

M1 M0

Master (M7–M0: Transfer data)

Serial I/O register (SI)

SIN pin

SOUT pin

Slave (S7–S0: Transfer data)

Serial I/O register (SI)

M7 M6 M5 M4

M1 M0

M6 M5 M4

S0 M7

S7 S6 S5 S4 S3 S2 S1 S0

S7 S6 S5 S4 S3 S2 S1

S7 S6 S5 S4 S3 S2

M7 M6 M5 M4

M1 M0

Transfer data setting

Transfer starts

Falling of clock

Rising of clock

Falling of clock

Transfer completes

∗

SOUT

SCK

SIN

SCK

SOUT

SIN

4513/4514

Master (internal clock selected)

Slave (external clock selected)

Control signal

Note: The control signal is used to inform the master by the pin level

that the slave is in a ready state to receive.

The 4513/4514 Group does not have a control pin exclusively

used for serial I/O.

Accordingly, if a control signal is required, use the normal input/output ports.

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