MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 165

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
NOTE:
Figure 12-4
Figure 12-4
When DDRAx is a logic 1, reading address $0000 reads the PTAx data
latch. When DDRAx is a logic 0, reading address $0000 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
shows the port A I/O logic.
does not apply to PTA2
Input/Output (I/O) Ports
Figure 12-4. Port A I/O Circuit
RESET
DDRAx
PTAx
TO KEYBOARD INTERRUPT CIRCUIT
Input/Output (I/O) Ports
PTAPUEx
30 k
Port A
PTAx
165