UM10601 Datasheet, PDF (100/313 Pages) NXP Semiconductors – LPC800 User manual

UM10601 _{9.1 How to readTonhtleyhCRsaeihwsvvaai.ticcpl1ahh.tb0melae—rapot9rnti7x:epiNLasrroPitdsveCeLnP8mtiCc0b8a0e1l 2froSM2rw10a01li1lt2FLcDPhHC28m00a0anptdraLirxPtsC. 8T1h2eMU10S}^D_1A^R_F^A_RDP^F_TH^T_r21e^D₆^R_lai^AD_{mnaFRndTAidnSDFt}^TR_ahPAe^D_rIFy1^R_{cTADofuDFRurTrRAsneAFDecs}^TFR_{tprTiADoomDFRnnTRDAdsaARFDinTaFn}^AR_gTFrADue^TDFR_{aTRDAlARDFTFDARTRFADTADFRTFRDATADRF}
switch matrix select bits are reserved for all other parts.
9.2 Features
• Flexible assignment of digital peripheral functions to pins
• Enable/disable of analog functions
9.3 Basic configuration
Once configured, no clocks are needed for the switch matrix to function. The system clock
is needed only to write to or read from the pin assignment registers. After the switch matrix
is configured, disable the clock to the switch matrix block in the SYSAHBCLKCTRL
register.
Before activating a peripheral or enabling its interrupt, use the switch matrix to connect the
peripheral to external pins.
The boot loader assigns the SWD functions to pins PIO0_2 and PIO0_3. If the user code
disables the SWD functions through the switch matrix to use the pins for other functions,
the SWD port is disabled.
Remark: For the purpose of programming the pin functions through the switch matrix,
every pin except the power and ground pins is identified in a package-independent way by
its GPIO port pin number.
UM10601
Preliminary user manual
All information provided in this document is subject to legal disclaimers.
Rev. 1.0 — 7 November 2012
© NXP B.V. 2012. All rights reserved.
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