MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 386

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

Input/Output (I/O) Ports
18.4.3 Port B LED Control Register (LEDB)
Data Sheet
386
Address:
Table 18-3
The port-B LED control register (LEDB) controls the direct LED drive
capability on PTB5–PTB0 pins. Each bit is individually configurable and
requires that the data direction register, DDRB, bit be configured as an
output.
When the IRSCI is enabled, setting the LEDB0 bit also enables high
current (15mA) sink capability for the TxD pin.
LEDB[5:0] — Port B LED Drive Enable Bits
Notes:
Reset:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
Read:
Write:
DDRB
Freescale Semiconductor, Inc.
These read/write bits are software programmable to enable the direct
LED drive on an output port pin.
Bit
0
1
For More Information On This Product,
1 = Corresponding port B pin is configured for direct LED drive,
0 = Corresponding port B pin is configured for standard drive
$000C
Bit 7
Figure 18-8. Port B LED Control Register (LEDB)
PTB Bit
with 15mA current sinking capability
0
0
X
summarizes the operation of the port B pins.
X
(1)
Go to: www.freescale.com
Input/Output (I/O) Ports
6
0
0
Table 18-3. Port B Pin Functions
Input, Hi-Z
I/O Pin Mode
Output
LEDB5
5
0
(2)
Accesses to DDRB
LEDB4
4
0
DDRB[7:0]
DDRB[7:0]
Read/Write
LEDB3
3
0
MC68HC908LJ24/LK24 — Rev. 2
LEDB2
PTB[7:0]
2
0
Read
Pin
Accesses to PTB
LEDB1
1
0
MOTOROLA
PTB[7:0]
PTB[7:0]
Write
LEDB0
Bit 0
0
(3)