mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 399

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

18.8.3 Port F LED Control Register (LEDF)
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
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.
Bit
0
1
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
with 15mA current sinking capability
PTF Bit
0
X
summarizes the operation of the port F pins.
X
(1)
Input/Output (I/O) Ports
LEDF6
6
0
Table 18-7. Port F Pin Functions
Input, Hi-Z
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]
PTF[7:0]
Data Sheet
Write
LEDF0
Bit 0
Port F
0
(3)
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