mc68hc05j1avp Freescale Semiconductor, Inc, mc68hc05j1avp Datasheet - Page 66

• Manufacturer Part Number: mc68hc05j1avp
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Parallel Input/Output (I/O)
Technical Data
66
Pulldown
1. X = Don’t care
2. U = Undefined
Option
Mask
Yes
Yes
Yes
Yes
No
No
PDIAx
X
Control Bits
X
0
0
1
1
(1)
DDRAx
0
1
0
1
0
1
When a port A pin is programmed as an output, reading the port bit
actually reads the value of the data latch and not the voltage on the pin
itself. When a port A pin is programmed as an input, reading the port bit
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its DDR bit.
operations of the port A pins.
Freescale Semiconductor, Inc.
pulldown on
pulldown on
For More Information On This Product,
Output,
I/O Pin
Output
Output
Mode
Input,
Input,
Input,
hi-z
hi-z
Table 7-1. Port A Pin Functions
Go to: www.freescale.com
Parallel Input/Output (I/O)
Read
U
U
U
U
U
U
(2)
Accesses
to PDRA
PDIA7–PDIA0 DDRA7–DDRA0
PDIA7–PDIA0 DDRA7–DDRA0
PDIA7–PDIA0 DDRA7–DDRA0
PDIA7–PDIA0 DDRA7–DDRA0 PA7–PA00
PDIA7–PDIA0 DDRA7–DDRA0
PDIA7–PDIA0 DDRA7–DDRA0
Write
Read/Write
Table 7-1
Accesses
to DDRA
summarizes the
MC68HC05J1A — Rev. 3.0
PA7–PA0
PA7–PA0
Read
Pin
Pin
Pin
to PORTA
Accesses
MOTOROLA
PA7–PA0
PA7–PA0
PA7–PA0
PA7–PA0
PA7–PA0
PA7–PA0
Write