mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 278

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
14.7 Port Options
Technical Data
278
When bit DDREx is a logic 1, reading address $0008 reads the PTEx
data latch. When bit DDREx is a logic 0, reading address $0008 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 E pins.
All pins of port A, port C, and port E have programmable pullup resistors.
Port D has programmable LED drive capability; PTD5–PTD2 each have
10mA high current sink, and PTD1–PTD0 each have 25mA high current
sink.
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRE
Bit
0
1
READ DDRE ($0009)
WRITE DDRE ($0009)
WRITE PTE ($0008)
READ PTE ($0008)
Input/Output (I/O) Ports
PTE
X
Bit
X
(1)
Table 14-5. Port E Pin Functions
Figure 14-13. Port E I/O Circuit
RESET
I/O Pin Mode
Input, Hi-Z
Output
(2)
DDREx
PTEx
Read/Write
DDRE[4:0]
DDRE[4:0]
Accesses
to DDRE
Table 14-3
MC68HC908JB16
PTE[4:0]
Freescale Semiconductor
Read
Accesses to PTE
Pin
summarizes
PTE[4:0]
PTE[4:0]
—
Write
Rev. 1.1
PTEx
(3)