ST72311R datasheet(47/164 Pages) STMICROELECTRONICS

47 / 164 page

ST72311R, ST72511R, ST72512R, ST72532R

47/164

MISCELLANEOUS REGISTERS (Cont’d)

MISCELLANEOUS REGISTER 2 (MISCR2)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = IPA

Interrupt polarity for port A

This bit is used to invert the sensitivity of the port A

[3:0] external interrupts. It is set and cleared by

software.

0: No sensitivity inversion

1: Sensitivity inversion

See Section 9.1 ”I/O PORT INTERRUPT SENSI-

TIVITY” on page 45 and the description of the IS2x

bits of the MISCR1 register for more details.

Bit 6 = IPB

Interrupt polarity for port B

This bit is used to invert the sensitivity of the port B

[3:0] external interrupts. It is set and cleared by

software.

0: No sensitivity inversion

1: Sensitivity inversion

See Section 9.1 ”I/O PORT INTERRUPT SENSI-

TIVITY” on page 45 and the description of the IS1x

bits of the MISCR1 register for more details.

Bit 5:4 = BC[1:0]

Beep control

These 2 bits select the PF1 pin beep capability.

The beep output signal is available in ACTIVE-

HALT mode but has to be disabled to reduce the

consumption.

Bit 3 = TLIS

TLI sensitivity

This bit allows to toggle the TLI edge sensitivity. It

can be set and cleared by software only when

TLIE bit is cleared.

0: Falling edge

1: Rising edge

Bit 2 = TLIE

TLI enable

This bit allows to enable or disable the TLI capabil-

ity on the dedicated pin. It is set and cleared by

software.

0: TLI disabled

1: TLI enabled

Note: a parasitic interrupt can be generated when

clearing the TLIE bit.

Bit 1 = SSM

SS mode selection

This bit is set and cleared by software.

0: Normal mode - the level of the SPI SS signal is

input from the external SS pin.

1: I/O mode (PC7), the level of the SPI SS signal is

read from the SSI bit.

Bit 0 = SSI

SS internal mode

This bit replaces pin SS of the SPI when bit SSM is

set to 1. (see SPI description). It is set and cleared

by software.

IPA

IPB

BC1

BC0

TLIS

TLIE

SSM

SSI

BC1

BC0

Beep mode with fOSC=16MHz

Off

~2-KHz

Output

Beep signal

~50% duty cycle

~1-KHz

~500-Hz

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