at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 113

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

13.7.2.2
13.8
7734M–AVR–03/10
PSCOUTn1
PSCOUTn0
Period
PSC Inputs
DT0
Enhanced Mode
OT0
The waveform frequency is defined by the following equation:
The Enhanced Mode uses the previously described method to generate a high resolution frequency.
13-13
Figure 13-13. Enhanced Mode, Timing Diagram
The supplementary step in counting to generate f
frame according to the fractional divider.
page
The waveform frequency is defined by the following equations:
d is the fractional divider factor.
The FWM can be applied on different locations within the PSC output waveforms as defined per
13-15 on page 137
Part A or B of PSC has its own system to take into account one PSC n internal input. Each part A or B is
configured by the PSC n Input A/B Control Register (PFRCnA/B
figuration Register ((see Section “PSC 2 Configuration Register – PCNF2”, page 135)
The PSC input module A is shown on
112.
gives an example of FWM with PBFMn1:0 = 00.
T1
DT1
f
PSCn
f2
OT1
f1
PSCn
=
PSCn
f
AVERAGE
----------------------------- -
PSCnCycle
=
=
-----
T
DT0
1
1
2
Table 13-14
-----
T
1
1
=
=
SeeTable 13-6, “Distribution of fb2 in the modulated frame,” on
=
------------------------------------------------------------------------------
(
----- -
16
OT0
d
-------------------------------------------------------------------- -
(
=
OT0
×
f1
-------------------------------------------------------------------- -
(
+
OT0
PSCn
b2
+
OT1
OT0
OT1
is added on the PSCn0 signal while needed in the
f
f
CLK_PSCn
CLK_PSCn
+
+
+
OT1
16 d
-------------- -
f
+
CLK_PSCn
DT0
16
–
DT0
+
T2
×
+
DT0
f2
page
+
DT1
DT1
PSCn
DT1
+
140) and the PSC n Extended Con-
+
DT1
)
1
)
)
OT1+1
AT90PWM81
DT0
Figure
Table
113