mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 396

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

Input/Output (I/O) Ports
18.7.3 Port E LED Control Register (LEDE)
Data Sheet
396
Address:
When DDREx is a logic 1, reading address $0008 reads the PTEx data
latch. When 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.
Table 18-6
The port-E LED control register (LEDE) controls the direct LED drive
capability on PTE7–PTE0 pins. Each bit is individually configurable and
requires that the data direction register, DDRE, bit be configured as an
output.
LEDE[7:0] — Port E 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:
DDRE
These read/write bits are software programmable to enable the direct
LED drive on an output port pin.
Bit
0
1
1 = Corresponding port E pin is configured for direct LED drive,
0 = Corresponding port E pin is configured for standard drive
LEDE7
$000E
Figure 18-19. Port E LED Control Register (LEDE)
Bit 7
with 15mA current sinking capability
PTE Bit
0
X
summarizes the operation of the port E pins.
X
(1)
Input/Output (I/O) Ports
LEDE6
6
0
Table 18-6. Port E Pin Functions
Input, Hi-Z
I/O Pin Mode
Output
LEDE5
5
0
(2)
Accesses to DDRE
LEDE4
4
0
DDRE[7:0]
DDRE[7:0]
Read/Write
LEDE3
MC68HC908LJ24/LK24 — Rev. 2.1
3
0
LEDE2
Freescale Semiconductor
PTE[7:0]
2
0
Read
Pin
Accesses to PTE
LEDE1
1
0
PTE[7:0]
PTE[7:0]
Write
LEDE0
Bit 0
0
(3)