PXD10RM Datasheet, PDF (1116/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

33.1.2 Features
The SGL has the following basic features:
• It can be used to produce two types of sounds — monotonic and polyphonic sound.
• It selects the PWM channels being used for sound generation and provides the PWM output from
single channel or anded output from 2 PWM channels depending on whether polyphonic or
monotonic sound is to be produced.
• It provides programmability to generate periodic or continuous sound, for desired duration which
may be predefined.
• It has the facility for enabling/disabling the generation of interrupts.
33.2 External signal description
pwm_ch0
pwm_ch15
Clock
SGL Top Level
sound_out
ipi_int_sgl
Figure 33-2. SGL External Signal Description
33.2.1 Detailed signal descriptions
Table 33-1. Detailed signal descriptions
Name
Function
I/O Reset¹
Clock
System clock
I
pwm_ch0 to pwm_ch15
PWM Channel output (0–15) signal coming from eMIOS0 Unified I
Channel #16 to Unified Channel #23, eMIOS1 Unified Channel
#16 to Unified Channel #23. This signal can have variable duty
cycle as well as variable frequency
sound_out
Output signal carrying the generated sound which will be fed into O
‘0’
the speaker interface
ipi_int_sgl
Interrupt signal generated by SGL whenever
SOUND_DURATION counter reaches ‘0’
1 _{This is the value which the output signals will have when the module is reset.}
O
‘0’
33-2
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor