CMX850L8 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX850L8' PDF : 103 Pages View PDF
Communications Controller
CMX850
1.5.3.4 Port Res Pull-up Registers (P1RES-P5RES)
Ports 1, 3, 4 and 5 each have a resistor pull-up control register which allows individual port pins to be
configured either with or without a pull-up resistor. The bits should be cleared to a 0 if no resistor is required,
or set to 1 to connect a 50kΩ (nominal) resistor between the pin and DVDD. A port pin should not be
configured with a pull-up resistor at the same time as being configured as an output with active pull-up/pull-
down drivers, otherwise power will be needlessly wasted when driving out a logic 0.
P1RES: SFR Address $93
P3RES: SFR Address $B3
P4RES: SFR Address $C3
P5RES: SFR Address $DB
All bits cleared to 0 on reset.
Bit:
7
6
5
4
3
2
1
0
Bits 7-0 of the resistor pull-up control register
© 2003 CML Microsystems Plc
22
D/850/6
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