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Chapter 2 Pin Functions
Features summary
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This chapter lists the ports of the microcontroller. It presents the configuration
of the ports for alternative functions. Noise elimination on input signals is
explained and a recommendation for the connection of unused pins is given at
the end of the chapter.
2.1 Overview
The microcontroller offers various pins for input/output functions, so-called
ports. The ports are organized in port groups.
To allocate other than general purpose input/output functions to the pins,
several control registers are provided.
For a description of the terms pin, port or port group, see "Terms" on page 39.
• Number of ports and port groups:
Device
µPD70F3427
all others
• 5V I/O:
Can be used as 3V I/O with degraded electrical parameters. Please refer to
the Electrical Target Specification.
• 24 high-drive ports for direct stepper motor drive.
• Configuration possible for individual pins.
• The following features can be selected for most of the pins:
– One out of two input thresholds
– Output current limit
– Open drain emulation
• 8 ports for Schmitt and non-Schmitt chararacteristic configurable.
• The following registers are offered for most of the ports:
– Direct register for reading the pin values
– Port register with selectable read source (for improved bit set / bit clear
capabilities)
Preliminary User's Manual U17566EE1V2UM00
Number of ports
Number of port groups
I/O ports
Input ports
101
16
15
98
16
14
35
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