ST72589BW datasheet(40/158 Pages) STMICROELECTRONICS

40 / 158 page

ST72589BW, ST72389BW

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MISCELLANEOUS REGISTERS (Cont’d)

6.3 Miscellaneous Registers Description

MISCELLANEOUS REGISTER 1 (MISCR1)

Read /Write

Reset Value: 0000 0000 (00h)

Bit 7:6 = IS11-IS10

EI1,3, 5 Sensitivity

The selection issued from IS11,IS10 combination

is applied to the following external interrupts: EI1

(port A3..0) EI3 (port B) and EI5 (port D).

These 2 bits can be written only when the current

interrupt software priority in the CC (Condition

Code) register is set to level 3 (I1:0=11).

Bit 5:4 = IS21-IS20

EI2,4 Sensitivity

The selection issued from IS21,IS20 combination

is applied to the following external interrupts: EI2

(port A7..4) and EI4 (port C).

The functional description is equal to the IS1x one.

Bit 3:2 = Reserved, always read as 0.

Bit 1 = NMIS

NMI Sensitivity

This bit allows to toggle the NMI edge sensitivity. It

can be set and cleared by software only when

NMIE bit is cleared.

0: falling edge

1: rising edge

Bit 0 = NMIE

NMI Enable

This bit allows to enable or disable the NMI capa-

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

software.

0: NMI disable

1: NMI enable

MISCELLANEOUS REGISTER 2 (MISCR2)

Read /Write

Reset Value: 0000 0000 (00h)

Bit 7 = Reserved.

Bit 6:4 = MCO

Main clock-out control

BC1-BC0

Beep Control

These 3 bits select the PC7 pin configuration.

They are set and cleared by software.

Note: the clock out and beep capabilities are not

available in HALT modes.

Bit 3:2 = Reserved, always read as 0.

Bit 1 = SSM

SS mode selection

It is set and cleared by software.

0: Normal mode - SS uses information coming

from the SS pin of the SPI.

1: I/O mode, the SPI uses the information stored

into bit SSI.

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.

IS11

IS10

IS21

IS20

NMIS NMIE

ISx1

ISx0

External Interrupt Sensitivity

Falling edge and low level

Falling edge only

Rising edge only

Rising and falling edge

MCO

BC1

BC0

SSM

SSI

MCO

BC1

BC0

PC7 Configuration

Standard I/O

fOSC/2 Clock out

~2-KHz

Output

Beep signal

w/ fOSC=16MHz

~50% duty cycle

~1-KHz

~500-Hz

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