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EM6617 Datasheet(PDF) 20 Page - EM Microelectronic - MARIN SA

Part No. EM6617
Description  Ultra Low Power Microcontroller with ADC AND EEPROM
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Maker  EMMICRO [EM Microelectronic - MARIN SA]
Homepage  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6617 Datasheet(HTML) 20 Page - EM Microelectronic - MARIN SA

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EM6617
Copyright
© 2005, EM Microelectronic-Marin SA
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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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