cp2200 Silicon Laboratories, cp2200 Datasheet - Page 45

• Manufacturer Part Number: cp2200
• Description: Single-chip Ethernet Controller
• Manufacturer: Silicon Laboratories

10.5. Disabling Secondary Device Functions
The LED Drivers, weak pull-ups, and V
supply current for the V
the MOTEN and MUXEN pins are tied to ground, but will cause the address and data pins to float (causing
undefined device behavior and increased power consumption) if they are not externally driven or pulled to a
defined logic level using pull-up or pull-down resistors. The internal weak pull-ups should not be disabled unless all
digital pins are externally driven to a logic high or logic low state.
Bits 7–4: UNUSED. Read = 0000b, Write = don’t care.
Bit 3
Bit 2
Bit 1:
Bit 0:
R/W
Bit7
—
ACTEN: Activity LED Enable
0: Activity LED disabled.
1: Activity LED enabled.
LINKEN: Link LED Enable (Link/Activity LED on CP2201)
0: Link (Link/Activity) LED disabled.
1: Link (Link/Activity) LED enabled.
WEAKD: Weak Pull-up Disable
0: Weak pull-ups are enabled.
1: Weak pull-ups are disabled.
Reserved. Read = 0b; Must write 0b.
R/W
Bit6
—
Register 15. IOPWR: Port Input/Output Power Register
DD
Monitor is specified in Table 13 on page 42. Disabling weak pull-ups will save current if
R/W
Bit5
—
R/W
DD
Bit4
—
Monitor can be disabled to minimize power consumption. The typical
ACTEN
R/W
Bit3
Rev. 1.0
LINKEN
R/W
Bit2
WEAKD Reserved 00000000
R/W
Bit1
R/W
Bit0
CP2200/1
Reset Value
Address:
0x70
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