ST72C171 datasheet(45/152 Pages) STMICROELECTRONICS

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ST72C171

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OP-AMP MODULE (Cont’d)

OP-AMP INTERRUPT AND READOUT REGIS-

TER (OAIRR)

Read/Write*

Reset value: 0000 0000 (00h)

Bit 7 = OA1IE

OA1 interrupt enable

This bit is set and reset by software. When it is set,

it enables an interrupt to be generated if the OA1P

bit and the OA1V bit have the same value.

0: OA1 interrupt disabled

1: OA1 interrupt enabled

Bit 6 = OA1P

OA1 interrupt polarity select

This bit is set and reset by software. It specifies the

OA1 SPGA output level which will generate an in-

terrupt if the bit OA1IE is set.

0: Active low

1: Active high

Bit 5 = OA1V

OA1 output value (read only)

This bit is set and reset by hardware. It contains

the OA1 SPGA output voltage value filtered by a

Schmitt trigger.

0: OA1+ voltage < OA1- voltage

1: OA1+ voltage > OA1- voltage

Bit 4 = OA1ON

OA1 on/off (low power)

This bit is set and reset by software. It reduces

power consumption when reset.

0: Op-amp 1 off

1: Op-amp 1 on

Bit 3 = OA2IE

OA2 interrupt enable

This bit is set and reset by software. When it is set,

it enables an interrupt to be generated if the OA2P

bit and the OA2V bit have the same value.

0: OA2 interrupt disabled

1: OA2 interrupt enabled

Bit 2 = OA2P

OA2 interrupt polarity select

This bit is set and reset by software. It specifies the

OA2 SPGA output level which will generate an in-

terrupt if the bit OA2IE is set.

0: Active low

1: Active high

Bit 1- OA2V

OA2 output value (read only)

This bit is set and reset by hardware. It contains

the OA2 SPGA output voltage value filtered by a

Schmitt trigger.

0: OA2+ voltage < OA2- voltage

1: OA2+ voltage > OA2- voltage

Bit 0 - OA2ON

OA2 on/off (low power)

0: Op-amp 2 off (reducing power consumption)

1: Op-amp 2 on

Note: If OA1ON, OA2ON and OA3ON are 0, The

entire module is disabled, giving the lowest power

consumption.

* OA1V and OA2V are read only.

OA1IE OA1P OA1V OA1ON OA2IE OA2P

OA2V OA2ON

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