7477 datasheet(97/361 Pages) RENESAS

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HARDWARE

1-90

7470/7471/7477/7478 GROUP USER’S MANUAL

1.13 Serial I/O

1.13A 7470/7471 group part

1.13A.1 Operation description

The 7470/7471 group incorporates a clock synchronous Serial I/O.

The 8 shift clocks obtained by the clock control circuit are used as synchronous clocks for transmitting

or receiving data. The transmit operation of the transmit side and the receive operation of the receive side

are simultaneously executed in synchronization with these shift clocks.

q The transmit side transmits data bit by bit from the P15/SOUT pin in synchronization with the fall of each

shift clock.

q The receive side receives data bit by bit from the P14/SIN pin in synchronization with the rise of each shift

clock.

Figure 1.13A.1 shows a Serial I/O block diagram.

Fig. 1.13A.1 Serial I/O block diagram

1/2

1/4

CM7

Counter

XCIN

XIN

1/2

1/4

1/64

SM1

SM0

SM2

Synchronous circuit

SM5

SARDY

SRDY

SM6

SIN

SOUT

SRDY

∗

CLK input

CLK output

Serial I/O counter (3)

(Address 00DE16)

Serial I/O interrupt

request

(Address 00DE16)

Byte counter (4)

Data bus

(Address 00DD16)

Serial I/O register (8)

V: The 7470 group is not provided with the X

pin.

CIN

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