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C511 Datasheet(PDF) 35 Page - Siemens Semiconductor Group

Part # C511
Description  8-Bit CMOS Microcontroller
PDF  128 Pages
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

C511 Datasheet(HTML) 35 Page - Siemens Semiconductor Group

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Semiconductor Group
6-2
On-Chip Peripheral Units
Port 1, 2 and 3 output drivers have internal pullup FET’s (see figure 6-6-14). Each I/O line can be
used independently as an input or output. To be used as an input, the port bit must contain a one
(1) (that means for figure 6-2: Q=0), which turns off the output driver FET n1. Then, for ports 1, 2
and 3, the pin is pulled high by the internal pullups, but can be pulled low by an external source.
When externally pulled low the port pins source current (
I
IL or ITL). For this reason these ports are
sometimes called "quasi-bidirectional".
Figure 6-14
Basic Output Driver Circuit of Ports 1, 2 and 3



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