MC68HC05K0 Datasheet, PDF (27/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
General Description
Pin Assignments
1.6.2.5 External Clock Signal
An external clock from another complementary metal oxide
semiconductor (CMOS)-compatible device can drive the OSC1 input,
with the OSC2 pin unconnected, as Figure 1-9 shows.
MCU
1.6.3 RESET
1.6.4 IRQ/V_PP
1.6.5 PA7–PA0
EXTERNAL
CMOS CLOCK
Figure 1-9. External Clock Connections
A logic 0 on the RESET pin forces the MCU to a known startup state.
See 5.3 Reset Types.
The IRQ/V_PP pin has these functions:
• Applying asynchronous external interrupt signals.
See 4.3 Interrupt Types.
• Applying the personality EPROM programming voltage
(MC68HC05K1 only). See 9.3 PEPROM Registers.
PA7–PA0 are the pins of port A, a general-purpose, bidirectional I/O
port. See 7.3 Port A.
All port A pins have mask-optional pulldown devices that sink
approximately 100 µA. See 7.3.3 Pulldown Register A. If the mask
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
General Description
For More Information On This Product,
Go to: www.freescale.com
Technical Data