Led Pulse Generator Block Diagram - Texas Instruments OMAP5910 Technical Reference Manual

LED Pulse Generator
7.9 LED Pulse Generator
Figure 7–43. LED Pulse Generator Block Diagram
Bus
TIPB
interface
nstrobe
Reset
CLK32K
7.9.1 Features
7-100
The LED pulse generator (LPG) module controls an indication LED (see
Figure 7–43). The blinking period is programmable between 152 ms and 4s,
and the LED can be switched on permanently. The OMAP5910 device has two
LPG modules. Each LPG module drives a single output pin on the OMAP5910
device which can be used to switch an LED driver.
LED
perctrl
pulse
Two
generator
decoders
onctrl
3 to 10
and
3 to 5
clk_256
Divider
The LPG has the following features:
-
Divider generating a 256-Hz frequency clock
-
TIPB control interface
-
Two 8-bit registers to control the whole LPG block
-
Decoder for three blink frequency control bits (LPG2-0)
-
Decoder for three pulse width control bits (LPG5-3)
-
Programmable counter with integrated comparison for the PWM
-
Synchronous control logic for the output and the counter
-
Multiplexer to generate a faster clock for testing
perm_on
lpgres
Synchronous
control logic
perlpg
onlpg
Programmable
counter and
comparator
lpg_led
or
for
output
and
counter
1