CMX867(2000) Ver la hoja de datos (PDF) - CML Microsystems Plc

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CMX867
(Rev.:2000)

Low Power V.22 Modem

CML Microsystems Plc 

Low Power V.22 Modem

CMX867

General Control Register b8: Powerup

This bit controls the internal power supply to most of the internal circuits, including the Xtal

oscillator and VBIAS supply. Note that the General Reset command clears this bit, putting the

device into Powersave mode.

When the device is switched from Powersave mode to normal operation by setting the Powerup

bit to 1, about 20ms should be allowed for the internal circuits, Xtal oscillator and VBIAS to

stabilise before starting to use the transmitter or receiver.

Changing the Powerup bit from 0 to 1 clears all bits of the Transmit Mode and Receive Mode

Registers and clears b15 and b13-0 of the Status Register.

b8 = 1

b8 = 0

Device powered up normally

Powersave mode (all circuits except Ring Detect, RDRVN and C-BUS

interface disabled)

General Control Register b7: Reset

Setting this bit to 1 resets the CMX867’s internal circuitry, clearing all bits of the Transmit and

Receive Mode Registers and b15 and b13-0 of the Status Register.

b7 = 1

b7 = 0

Internal circuitry in a reset condition.

Normal operation

General Control Register b6: IRQNEN (IRQN O/P Enable)

Setting this bit to 1 enables the IRQN output pin.

b6 = 1

b6 = 0

IRQN pin driven low (to VSS) if the IRQ bit of the Status Register = 1

IRQN pin disabled (high impedance)

General Control Register b5-0: IRQ Mask bits

These bits affect the operation of the IRQ bit of the Status Register as described in section

1.5.10.7

© 2000 Consumer Microcircuits Limited

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D/867/1

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