mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 216

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

Input/Output Ports (I/O)
12.8 Port Options
Technical Data
216
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 B, port C, and port E have programmable pullup
resistors. Port pins PTD5–PTD0 have LED drive capability. Port pins
PTE4 and PTE3 have 10mA high current drive capability.
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 ($000C)
WRITE DDRE ($000C)
WRITE PTE ($0008)
READ PTE ($0008)
Input/Output Ports (I/O)
PTE
X
Bit
X
(1)
Table 12-6. Port E Pin Functions
Figure 12-16. Port E I/O Circuit
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
RESET
I/O Pin Mode
Input, Hi-Z
Output
(2)
DDREx
PTEx
Read/Write
DDRE[4:0]
DDRE[4:0]
Accesses
to DDRE
Table 12-4
PTE[4:0]
Freescale Semiconductor
Read
Accesses to PTE
Pin
summarizes
PTE[4:0]
PTE[4:0]
Write
PTEx
(3)