UPD17708 datasheet(242/358 Pages) RENESAS

242 / 358 page

240

µPD17704, 17705, 17707, 17708, 17709

16.2.10 Cautions on setting and reading data

Data is set to the presettable shift register 0 by using the “PUT SIO0SFR, DBF” instruction.

To read the data of this register, the “GET DBF, SIO0SFR” instruction is used.

Set or read data of the register in the wait status. If the wait status is released, data may not be correctly set or

read depending on the status of the shift clock pin.

The following table shows the data setting and reading timing, and points to be noted.

Table 16-3. Reading and Writing Data of Presettable Shift Register 0 and Cautions

Status on Execution

Status of Shift

I2C Bus Mode

Serial I/O Mode

of PUT/GET

Clock Pin

Wait

Read (GET)

• I2C bus mode:

Normal read

status

Write (PUT)

fixed to low

Normal write

• Serial I/O mode:

Outputs contents of MSB when wait

fixed to high

status is released next time

status is released next time and shift

(during transmission)

clock pin goes low (during transmission)

Wait

Read (GET)

High level

Cannot be read normally

released

Contents of SIO0SFR are lost

status

Low level

Normal read

Write (PUT)

High level

Normal write

Outputs contents of MSB at falling

Outputs contents of MSB when PUT

of clock next to one at which PUT

instruction is executed.

instruction has been executed.

Clock counter is not reset

Low level

Cannot be read normally

Contents of SIO0SFR are lost

MSB

Data

Wait released

PUT SIO0SFR, DBF

Clock

MSB

Data

Wait released

PUT SIO0SFR, DBF

Clock

MSB

Data

Clock

PUT SIO0SFR, DBF

MSB

Data

PUT SIO0SFR, DBF

Clock

UPD17708 Datasheet(PDF) 242 Page - Renesas Technology Corp

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