MC68HC05P1ADW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P1ADW Datasheet - Page 56

• Manufacturer Part Number: MC68HC05P1ADW
• Description: General Release Specification
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Input/Output Ports
7.3 Port A
General Release Specification
INTERNAL HC05
DATA BUS
WRITE $0004
WRITE $0000
READ $0004
READ $0000
RESET
(RST)
Port A is an 8-bit bidirectional port, which can share its pins with the
interrupt system as shown in
the corresponding bits in a data direction register and a data register.
The port A data register is located at address $0000. The port A data
direction register (DDRA) is located at address $0004. Reset clears the
DDRA, thereby initializing port A as an input port. The port A data
register is unaffected by reset.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 7-1. Port A I/O Circuitry
REGISTER BIT
REGISTER BIT
DIRECTION
DATA
DATA
Go to: www.freescale.com
Input/Output Ports
(PULLUP INHIBIT)
MASK OPTION
Figure
7-1. Each port A pin is controlled by
OUTPUT
V
MC68HC05P1A
DD
INTERRUPT
SYSTEM
TO
PULLUP
—
PIN
I/O
Rev. 3.0