7477 datasheet(300/354 Pages) RENESAS

300 / 354 page

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

3-6

APPENDIX

3.1 Control registers

Fig. 3.1.10 Structure of Serial I/O counter and Byte counter

Fig. 3.1.9 Structure of Serial I/O register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O register (SIO) [Address

Function

At reset

R W

Serial I/O register (7470/7471 group)

A value of “0016” to “FF16” can be

set as transmit data.

At the transmit, data is transmitted one

bit at a time starting with the least

significant bit.

At the receive, data is received one bit

at a time starting with the most

significant bit.

At transmit:

At receive:

00DD16]

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O counter and Byte counter [Address

Function

At reset

Serial I/O counter and Byte counter (7470/7471 group)

Byte counter

?? !

When using the byte specification mode, set

a value of “0016” to “0F16.” Supposing that the

value to be written into the byte counter is “n,”

a Serial transmit/receive is performed with the

clock of the “n + 1”-th byte.

Serial I/O counter

When the internal clock is selected as a

synchronous clock, this counter generates 8

shift clocks.

When transmit data is written into the Serial

I/O register, “07 16” is set in the Serial I/O

counter.

Nothing is allocated for this bit. This is write

disabled bit and is undefined at reading.

00DE16]

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