mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 212

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output Ports (I/O)
12.7 Port E
Technical Data
212
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.
Port E is a 5-bit special function port that shares three of its pins with the
timer interface module (TIM) and two of its pins with the USB data pins
D+ and D–. PTE4 and PTE3 are open drain when configured as output.
NOTES:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRD
Bit
0
1
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
PTD Bit
Input/Output Ports (I/O)
X
X
(1)
Table 12-5. Port D Pin Functions
Figure 12-13. Port D I/O Circuit
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
RESET
I/O Pin Mode
Input, Hi-Z
Output
(2)
DDRDx
PTDx
Read/Write
DDRD[7:0]
DDRD[7:0]
Accesses
to DDRD
Table 12-5
PTD[7:0]
Freescale Semiconductor
Read
Accesses to PTD
Pin
summarizes
PTD[7:0]
PTD[7:0]
Write
PTDx
(3)