PS081 datasheet(73/155 Pages) AMSCO

73 / 155 page

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4-16

PSØ81

Example:

;initialization

jsub

init_holtek

;measurement

ramadr 20

;HB0

move

x, r

no2lcd

x, 1

newlcd

jsub

driver_4

;further routines

Please see code snippet in the appendix, explaining sub-routines ‘driver_4’ and ‘init_holtek’. Basically,

the holtek driver needs to be initialized and after the newlcd opcode the content is sent to the LCD by

the sub-routine ‘driver_4’ (MUX4 LCD).

4.4

I/O-pins

PSØ81 has six I/O pins:

0 - SPI_DO_IO0

Serial data out (SDO) or multipurpose I/O

1 - SPI_DI_IO1

Serial data in (SDO) or multipurpose I/O

2 - SPI_CLK_IO2 Serial clock (SDO) or multipurpose I/O

3 - MULT_IO3

In Wheatstone application used for the analog multiplexer, interrupt.

Otherwise, output or multipurpose I/O

4 - MULT_IO4

Multipurpose I/O

5 - MULT_IO5

Multipurpose I/O

The pins can be programmed as inputs or outputs with pull-up or pull-down resistors in case the chip

is in stand-alone mode (SPI interface not used, SPI_ENA=0). Pin MULT_IO3 can be used as input/

output only when Wheatstone mode is not used. If none of the pins is configured as an output, the

number of inputs can be increased up to 21 as described later on.

Additionally, Pin 24, SPI_CSN_RST can be used as reset input in case the SPI interface is not used

(SPI_ENA = 0). The reset is high active.

4.4.1

Configuration

SPI_DO_IO0

Configreg_11, bit 16,17 io_en_0_sdo

SPI_DI_IO1

Configreg_11, bit 18,19 io_en_1_sdi

SPI_CLK_IO2

Configreg_11, bit 20,21 io_en_2_sck

MULT _IO3

Configreg_11, bit 22,23 io_en_3_mio

MULT _IO4

Configreg_17, bit 2,3

en_io4

MULT _IO5

Configreg_17, bit 4,5

en_io5

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