mc68hc05l28 Freescale Semiconductor, Inc, mc68hc05l28 Datasheet - Page 28

• Manufacturer Part Number: mc68hc05l28
• Description: ?exible General-purpose Microcomputer
• Manufacturer: Freescale Semiconductor, Inc

2
2.2
Pin assignments are shown in Section 13.
2.2.1
Power is supplied to the microcontroller using these two pins. VDD is the positive supply and VSS
is ground.
It is in the nature of CMOS designs that very fast signal transitions occur on the MCU pins. These
short rise and fall times place very high short-duration current demands on the power supply. To
prevent noise problems, special care must be taken to provide good power supply bypassing at
the MCU. Bypass capacitors should have good high-frequency characteristics and be as close to
the MCU as possible. Bypassing requirements vary, depending on how heavily the MCU pins are
loaded.
2.2.2
This interrupt has a software option which offers two types of interrupt triggering sensitivity. It
contains an internal Schmitt trigger as part of its input to improve noise immunity.
2.2.3
This interrupt has a software option which offers four types of interrupt triggering sensitivity. It
contains an internal Schmitt trigger as part of its input to improve noise immunity. This interrupt can
be enabled/disabled independently.
2.2.4
This interrupt has a software option which offers four types of interrupt triggering sensitivity. It
contains an internal Schmitt trigger as part of its input to improve noise immunity. This interrupt can
be enabled/disabled independently.
MOTOROLA
2-6
VDD and VSS
IRQ1
IRQ2
IRQ0
Pin descriptions
MODES OF OPERATION AND PIN DESCRIPTIONS
MC68HC05L28
TPG