mc68hc705c9a Freescale Semiconductor, Inc, mc68hc705c9a Datasheet - Page 22

• Manufacturer Part Number: mc68hc705c9a
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.6.1 V
Power is supplied to the MCU using these two pins. V
1.6.2 V
This pin provides the programming voltage to the EPROM array. For normal operation, V
to V
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
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.
22
DD
.
DD
PP
and V
SS
PB0
PB1
PB2
PB3
PA6
PA5
PA4
PA3
PA2
PA1
PA0
for more detail.
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
1
2
3
4
5
6
7
8
9
10
11
Figure 1-8. 44-Pin QFP Pin Assignments
DD
is the positive supply and V
33
32
31
30
29
28
27
26
25
24
23
TCMP
PD5/SS
PD4/SCK
PD3/MOSI
PD2/MISO
PD1/TDO
PD0/RDI
PC0
PC1
PC2
PC3
Freescale Semiconductor
SS
PP
is ground.
should be tied