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EM6617 Datasheet(PDF) 20 Page - EM Microelectronic - MARIN SA |
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EM6617 Datasheet(HTML) 20 Page - EM Microelectronic - MARIN SA |
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20 / 65 page 
EM6617 Copyright © 2005, EM Microelectronic-Marin SA 20 www.emmicroelectronic.com 7.6 Port C The EM6617 has one globally configurable Input / Output port which is 4 bit wide (only two bits are available for 24 pin packages). Input or output mode can be set by writing the bit PCIOCntl in RegPCCntl register. “0“ = input mode (default), “1“ = output mode. The RegPCData register is used to write output data on port C. Input data is read directly on the input terminal and put onto the internal data bus. It is not stored in the RegPCData register. The port C terminal status can be read on address RegPCData even in output mode. Be aware that the data read on port C is not necessary of the same value as the data stored on RegPCData register. At any reset, the RegPCCntl register is cleared, thus setting the port in input mode. During SLEEP mode, PC[3:0] are in high impedance state. The port C is globally configurable to act as CMOS or Nch. open drain port , selectable in OPTPCandStr register ( NchOpDPC bit). 7.6.1 Pull-up or Pull-down On each terminal of PC[3:0] an internal input pull-up (metal mask MPCPU[n]) or pull-down (metal mask MPCPD[n]) resistor can be connected per metal mask option. Per default the two resistors are in place. In this case one can chose per software to have either a pull-up, a pull-down or no resistor. Figure 15. Port C Architecture Open Drain Option Register Port C Direction Register Port C Data Register Internal Data Bus Active Pull-down I / O Terminal PC[n] PCIOCntl PCData[n] DB[n] Read Read for PC[3:0] Port C Control Active Pull-up in Nch. Open Drain Mode Read NoPdPC Pull-down Option Register NchOpDPC mask option MPCPD[n] Mask Option MPCPD[n] 4 |
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