PS081 datasheet(75/155 Pages) AMSCO

75 / 155 page

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4-18

PSØ81

If a Simultaneous key is recognized, then the single button information is ignored.

Only one pair of simultaneously pressed buttons can be detected at once. Further buttons will

be ignored.

More than one buttons can be pressed, but only subsequently, not at once.

Please note: If you connect several inputs to each pin according to the suggested method you must

check the status of the inputs in register 26 to 28. You can NOT use register 22 in this case!

4.4.5

Input – read

4.4.5.1

4 inputs or less / inputs and outputs mixed

The flags of the inputs IO0 to IO3 are shown in status register, address 22. There is an indication of

the rising edge, falling edge or whether the button was pressed:

Status information RAM address 22* (like in former PSØ8)

Status[23]= flg_io3_mio

Status[22]= flg_io2_sck

Status[21]= flg_io1_sdi

Status[20]= flg_io0_sdo

Status[07]= flg_io3_mio_r Rising edge

Status[06]= flg_io2_sck_r Rising edge

Figure 4.11 Maximum Number of Inputs

*) Important: Please use RAM registers 26 to 28 to look for the button status if you use more than 6 I/Os. If you have less

than 6 I/Os you can check the status at RAM address 22.

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