M68HC05 datasheet(22/118 Pages) FREESCALE

tên linh kiện	M68HC05

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General Description

MC68HC05C9A Advance Information Data Sheet, Rev. 4.1

Freescale Semiconductor

Figure 1-8. 44-Pin QFP Pin Assignments

1.6.1 VDD and VSS

Power is supplied to the MCU using these two pins. VDD is the positive supply and VSS is ground.

1.6.2 VPP

This pin provides the programming voltage to the EPROM array. For normal operation, VPP should be tied

to VDD.

1.6.3 IRQ

This interrupt pin has an option that provides two different choices of interrupt triggering sensitivity. The

IRQ pin contains an internal Schmitt trigger as part of its input to improve noise immunity. Refer to

Chapter 4 Interrupts for more detail.

1.6.4 OSC1 andOSC2

These pins provide control input for an on-chip clock oscillator circuit. A crystal connected to these pins

provides a system clock. The internal frequency is one-half the crystal frequency.

PC3

PC2

PC1

PC0

PD0/RDI

PD1/TDO

PD2/MISO

PD3/MOSI

PD4/SCK

PD5/SS

TCMP

PA6

PA5

PA4

PA3

PA2

PA1

PA0

PB0

PB1

PB2

PB3

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