CMX867 查看數據表（PDF） - CML Microsystems Plc

零件编号

产品描述 (功能)

生产厂家

CMX867

Low Power V.22 Modem

CML Microsystems Plc 

Low Power V.22 Modem

CMX867

1.5.10.2 General Control Register

General Control Register: 16-bit write-only. C-BUS address $E0

This register controls general features of the CMX867 such as the Powersave and Loopback modes, the

IRQ mask bits and the Relay Drive output. It also allows the fixed compromise equalisers in the Tx and

Rx signal paths to be disabled if desired, and sets the internal clock dividers to use either a 11.0592 or a

12.288 MHz XTAL frequency.

All bits of this register are cleared to 0 by a General Reset command.

Bit: 15 14 13 12 11 10 9

8

7

6

5

4

3

2

1

0

0

0

0 Xtal LB Equ Rly Pwr Rst Irqn

freq

drv

en

IRQ Mask Bits

General Control Register b15-13: Reserved, set to 000

General Control Register b12: Xtal frequency

This bit should be set according to the Xtal frequency.

b12 = 1

b12 = 0

11.0592MHz

12.2880MHz

General Control Register b11: Analogue Loopback test mode

This bit controls the analogue loopback test mode. Note that in loopback test mode both

Transmit and Receive Mode Registers should be set to the same modem type and band or bit

rate.

b11 = 1

b11 = 0

Local analogue loopback mode enabled

No loopback (normal modem operation)

General Control Register b10: Tx and Rx Fixed Compromise Equalisers

This bit allows the Tx and Rx fixed compromise equalisers in the modem transmit and receive

filter blocks to be disabled.

b10 = 1

b10 = 0

Disable equalisers

Enable equalisers (600 or 1200bps modem modes)

General Control Register b9: Relay Drive

This bit directly controls the RDRVN output pin.

b9 = 1

b9 = 0

RDRVN output pin pulled to VSS

RDRVN output pin pulled to VDD

© 2004 Consumer Microcircuits Limited

20

D/867/5

Share Link: