TOOLSTICK542PP Silicon Laboratories Inc, TOOLSTICK542PP Datasheet - Page 153
TOOLSTICK542PP
Manufacturer Part Number
TOOLSTICK542PP
Description
PLATFORM PROG TOOLSTICK F542
Manufacturer
Silicon Laboratories Inc
Series
ToolStickr
Type
Microcontroller Programmerr
Specifications of TOOLSTICK542PP
Contents
2 Boards and USB Connecting Cable
Processor To Be Evaluated
C8051F542
Interface Type
USB
Operating Supply Voltage
2.7 V to 3.6 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F542
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1718
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- Download datasheet (3Mb)
C8051F54x
The output driver characteristics of the I/O pins are defined using the Port Output Mode registers (PnMD-
OUT). Each Port Output driver can be configured as either open drain or push-pull. This selection is
required even for the digital resources selected in the XBRn registers, and is not automatic. The only
exception to this is the SMBus (SDA, SCL) pins, which are configured as open-drain regardless of the
PnMDOUT settings. When the WEAKPUD bit in XBR2 is 0, a weak pullup is enabled for all Port I/O config-
ured as open-drain. WEAKPUD does not affect the push-pull Port I/O. Furthermore, the weak pullup is
turned off on an output that is driving a 0 to avoid unnecessary power dissipation.
Registers XBR0, XBR1, and XBR2 must be loaded with the appropriate values to select the digital I/O
functions required by the design. Setting the XBARE bit in XBR2 to 1 enables the Crossbar. Until the
Crossbar is enabled, the external pins remain as standard Port I/O (in input mode), regardless of the XBRn
Register settings. For given XBRn Register settings, one can determine the I/O pin-out using the Priority
Decode Table; as an alternative, the Configuration Wizard utility of the Silicon Labs IDE software will deter-
mine the Port I/O pin-assignments based on the XBRn Register settings.
The Crossbar must be enabled to use Port pins as standard Port I/O in output mode. Port output drivers
are disabled while the Crossbar is disabled.
Rev. 1.1
153
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