PS081 datasheet(76/155 Pages) AMSCO

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4-19

PSØ81

Status[05]= flg_io1_sdi_r Rising edge

Status[04]= flg_io0_sdo_r Rising edge

Status[03]= flg_io3_mio_f Falling edge

Status[02]= flg_io2_sck_f Falling edge

Status[01]= flg_io1_sdi_f Falling edge

Status[00]= flg_io0_sdo_f Falling edge

4.4.5.2

More than 4 inputs, no outputs

The status of the inputs can be queried from the status registers at RAM address 26 to 28.

The status information is updated every time the program jumps into the EEPROM (bug fix PSØ8).

Status_F, address 26:

Falling edges status

Status_R, address 27:

Rising edges status

Status_P, address 28:

Pressed edges status

Bit:

19 18

16 15

Input: 05 15 04 25 14 03

If two inputs are active at the same time, the PSØ81 handles this like an additional button. E.g., if

buttons MULT_IO3 and MULT_IO4 are high at the same time, then bit [14] will be set in Status_R and

Status_P. This allows the use of up to 21 buttons (see below).

4.5

SPI-Interface

4.5.1

Interfacing

The SPI interface is used to write the program, configuration and calibration data into the EEPROM.

It can further be used to operate the PSØ81 as a pure converter chip by means of an external mi-

crocontroller. In this case the pull-down resistors are no longer necessary.

Pulling SPI_ENA high switches the SPI interface on, the pins are used for the SPI interface and no

longer as I/O ports. It is necessary to send a positive pulse on the CSN line before each opcode.

Figure 4.12 SPI interfacing

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