mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 561

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

A.1.3
There are four groups of functional pins.
A.1.3.1
Those I/O pins have a nominal level of 3.3V or 5V depending on the application operating point. This
group of pins is comprised of all port I/O pins, the analog inputs, BKGD pin and the RESET inputs.The
internal structure of all those pins is identical, however some of the functionality may be disabled.
A.1.3.2
This group of pins is comprised of the VRH and VRL pins.
A.1.3.3
The pins XFC, EXTAL, XTAL dedicated to the oscillator have a nominal 2.5V level. They are supplied by
VDDPLL.
A.1.3.4
This pin is used for production testing only.
A.1.4
Power supply must maintain regulation within operating V
operating maximum current conditions. If positive injection current (V
injection current may flow out of V
Insure external V
greatest risk when the MCU is not consuming power; e.g. if no system clock is present, or if clock rate is
very low which would reduce overall power consumption.
Freescale Semiconductor
Pins
Current Injection
3.3V/5V I/O Pins
Analog Reference
Oscillator
TEST
DD5
load will shunt current greater than maximum injection current. This will be the
DD5
MC9S12E256 Data Sheet, Rev. 1.08
and could result in external power supply going out of regulation.
DD5
or V
DD
in
range during instantaneous and
> V
Appendix A Electrical Characteristics
DD5
) is greater than I
DD5
, the
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