MC68HC05F8 Datasheet, PDF (45/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
VDD
250 KΩ
PAx
x is a port A line
KEY is KEYE for PA0-PA3
and KEYX4-KEYX7 for PA4-PA7 respectively
KEY
+
PORT A DDR
Bit x
DDRA bit x line
select
To CPU
Port A bit x data line
5
PORT A DATA
BIT x
(a) Pull-up circuit for port A lines
PA0
PA1
PA2
&
PA3
PA4
PA5
&
&
Keyboard
&
&
interrupt
&
PA6
PA7
KEYE
&
KEYX7 KEYX6 KEYX5 KEYX4 Keyboard Control Register
(b) Keyboard interrupt circuit
Figure 5-4 Keyboard Interrupt Circuit
MC68HC05F8
INTERRUPTS
For More Information On This Product,
Go to: www.freescale.com
TPG
MOTOROLA
5-9