MC68HC705C9A Datasheet, PDF (22/118 Pages) Motorola, Inc – Microcontrollers

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