MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 399

• Manufacturer Part Number: MC68HC908LK24
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

18.8.3 Port F LED Control Register (LEDF)
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
Address:
When DDRFx is a logic 1, reading address $000A reads the PTFx data
latch. When DDRFx is a logic 0, reading address $000A reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 18-7
Port-F LED control register (LEDF) controls the direct LED drive
capability on PTF7–PTF0 pins. Each bit is individually configurable and
requires that the data direction register, DDRF, bit be configured as an
output.
LEDF[7:0] — Port F LED Drive Enable Bits
Notes:
Reset:
1. X = don’t care; except.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
Read:
Write:
DDRF
These read/write bits are software programmable to enable the direct
LED drive on an output port pin.
Freescale Semiconductor, Inc.
Bit
0
1
For More Information On This Product,
1 = Corresponding port F pin is configured for direct LED drive,
0 = Corresponding port F pin is configured for standard drive
LEDF7
$000F
Figure 18-23. Port F LED Control Register (LEDF)
Bit 7
PTF Bit
with 15mA current sinking capability
0
X
summarizes the operation of the port F pins.
X
(1)
Go to: www.freescale.com
Input/Output (I/O) Ports
LEDF6
6
0
Input, Hi-Z
Table 18-7. Port F Pin Functions
I/O Pin Mode
Output
LEDF5
5
0
(2)
Accesses to DDRF
LEDF4
4
0
Read/Write
DDRF[7:0]
DDRF[7:0]
LEDF3
3
0
LEDF2
PTF[7:0]
2
0
Input/Output (I/O) Ports
Read
Pin
Accesses to PTF
LEDF1
1
0
PTF[7:0]
Data Sheet
PTF[7:0]
Write
LEDF0
Bit 0
Port F
0
(3)
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