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CMX850L8 View Datasheet(PDF) - CML Microsystems Plc

Part Name
Description
MFG CO.
CMX850L8
CML
CML Microsystems Plc CML
'CMX850L8' PDF : 103 Pages View PDF
Communications Controller
CMX850
Modem Core:
Function:
– powersave/active
– idle mode
– CBUS interface
– modem functions
– output amplifiers
– input amplifiers
– VBIAS generator
– RD, HD and RDRVN
Controlled by:
CBUS $E0 bit 8
CBUS $E0 bit 7
CBUS $E0 bit 8
CBUS $E0 bit 8
and CBUS $EC
bits 1 – 4
CBUS $E0 bit 8
CBUS $E0 bit 8
Comment:
addressed through:
CBUSBUF (EB) bits 0 – 7
and CBUSCON (EA)
bits 0 and 2
Always active
Needs System Clock to
be active (9C bit 5)
Always active
Table 4 Powersave Functions
The CMX850 provides additional power management features, such as a low power RC oscillator and
speed-control options for the 8051 clock, which allow the current consumption to be further reduced when
the device is not fully operational (the standard 8051 Idle and Power Down modes of operation are also
available). Further enhancements enable the 8051 µC to automatically exit from speed control or power
down modes, without requiring a system reset.
X32K
32.768kHz X32KN
XTAL
11.0592MHz/
12.288MHz
Xtal
Osc
32.768kHz clock
b0
b2
32.768kHz
Xtal
OSCCON b4-3 Clock Divider
Osc
b4
System clock
RC
Osc
8051 Clock
Divider
8051 clock
SPDCON
Exit Pdown
SPXMASK
PDXMASK
Int 8-2,0
Figure 5 Oscillator and Power Management
© 2003 CML Microsystems Plc
29
D/850/6
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