mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 217

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

12.8.1 Port Option Control Register
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
Address:
The port option control register controls the pullup options for port A, B,
C, and E pins. It also controls the drive configuration on port D.
PTE20P — Port PTE2–PTE0 Pullup Enable
PTDLDD — LED Direct Drive Control
PTDILDD — Infrared LED Drive Control
Reset:
Read:
Write:
This read/write bit controls the pullup option for the PTE2–PTE0 pins,
regardless whether the pins are input or output.
This read/write bit controls the output current capability of
PTD5–PTD2 pins. When set, each port pin has 10mA current sink
limit. An LED can be connected directly between the port pin and V
without the need of a series resistor.
This read/write bit controls the output current capability of PTD1 and
PTD0 pins. When set, each port pin has 25mA current sink capability.
An infrared LED can be connected directly between the port pin and
V
DD
1 = Configure PTE2–PTE0 to have internal pullups to V
0 = Disconnect PTE2–PTE0 internal pullups
1 = PTD5–PTD2 configured for direct LED drive capability;
0 = PTD5–PTD2 configured as standard open-drain I/O port pin
1 = PTD1 and PTD0 configured for infrared LED drive capability;
0 = PTD1 and PTD0 configured as standard open-drain I/O port
.
PTE20P
Figure 12-17. Port Option Control Register (POCR)
$001D
Bit 7
when a pin is set as an output, the pin is an open-drain pin with
10mA current sink limit
when a pin is set as an output, the pin is an open-drain pin with
25mA current sink capability
pins
0
Input/Output Ports (I/O)
PTDLDD PTDILDD
6
0
0
5
PTE4P
0
4
PTE3P
3
0
PCP
2
0
Input/Output Ports (I/O)
PBP
1
0
Technical Data
Port Options
REG
Bit 0
PAP
0
217
DD