MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 200

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Input/Output (I/O) Ports
Advance Information
200
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
DDRD
Bit
0
1
0
1
PTD
Bit
X
X
X
X
Bit selected
by ADC
Yes
Yes
No
No
When bit DDRDx is a logic 1, reading address $0003 reads the PTDx
data latch. When bit DDRDx is a logic 0, reading address $0003 reads
the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
the operation of the port D pins.
Table 15-4. Port D Pin Functions
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
Input, Hi-Z
Input, Hi-Z
Input, Hi-Z
I/O Pin
Output
Mode
Input/Output (I/O) Ports
Figure 15-13. Port D I/O Circuit
RESET
DDRD[7:3, 1:0]
DDRD[7:3, 1:0]
DDRD[7:3, 1:0]
DDRD[7:3, 1:0]
Accesses to
Read/Write
DDRD
DDRDx
PTDx
PTD[7:3, 1:0]
PTD[7:3, 1:0]
Read
Pin
0
MC68HC708AS48
Table 15-4
Accesses to PTD
PTD[7:3, 1:0]
PTD[7:3, 1:0]
PTD[7:3, 1:0]
PTD[7:3, 1:0]
summarizes
Write
MOTOROLA
—
Rev. 4.0
(1)
(1)
PTDx