PXD10RM Datasheet, PDF (1120/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

33.3.3.5 SGL_STATUS register
Offset 0x10
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
R
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
W
w1c
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 33-8. SGL_STATUS register
Table 33-8. SGL_STATUS field descriptions
Field
Description
SDCIF Sound Duration Complete Interrrupt Flag bit. Reflects the status of the interrupt.
1 SDCIF set event has occurred due to generation of interrupt
0 SDCIF cleared
33.4 Functional description
The SGL can be used to produce two types of sounds as described below:
• Monotonic sound
The tone amplitude modulation is based on two different mixed signals.The first of these two
signals has a variable frequency and fixed duty cycle (signal1 in Figure 33-9). The second signal
has a fixed frequency and a variable pulse width for generation of the amplitude (signal2 in
Figure 33-9). The duty cycle of this signal represents the amplitude of the generated sound. The
sound generator is generally a PWM that generates 2 different signals and a mixer to generate a
tone at the output as shown in signal 3 of Figure 33-9. It is passed through a first-order low-pass
filter to produce signal4 in Figure 33-9. This signal can be fed to the speaker interface.
33-6
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor