M30843FJFP

Manufacturer Part NumberM30843FJFP
ManufacturerRenesas Electronics Corporation.
M30843FJFP datasheets

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Page 191/529:

Pulse Width Modulation Mode

Download datasheet (4Mb)Embed
PrevNext
M
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M
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8 /
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15.1.4 Pulse Width Modulation Mode
In pulse width modulation mode, the timer outputs pulse of desired width continuously (see Table 15.7).
The timer counter functions as either 16-bit pulse width modulator or 8-bit pulse width modulator. Figure
15.13 shows the TAiMR register (i=0 to 4) in pulse width modulation mode. Figures 15.14 and 15.15
show examples of how a 16-bit pulse width modulator operates and of how an 8-bit pulse width modulator
operates.
Table 15.7 Pulse Width Modulation Mode Specifications
Item
Count Source
f
1
Counting Operation
• The timer decrements a counter value
16-Bit PWM
• "H" width =
• Cycle =
8-Bit PWM
• "H" width
• Cycles =
Counter Start Condition
• External trigger input is provided
• Timer counter overflows or underflows
• The TAiS bit in the TABSR register is set to "1" (starts counting)
Counter Stop Condition
The TAiS bit is set to "0" (stops counting)
Interrupt Request Generation Timing On the falling edge of the PWM pulse
TAi
Pin Function
Programmable I/O port or trigger input
IN
TAi
Pin Function
Pulse output
OUT
Read from Timer
The value in the TAi register is indeterminate when read
Write to Timer
• When the timer counter stops, the value written to the TAi register is also written to
• While counting, the value written to the TAi register is written to the reload register
NOTES:
1. The CNT3 to CNT0 bits in the TCSPR register select no division (n=0) or divide-by-2n (n=1 to 15).
Page 170
R
e
. v
1
0 .
1
J
u
. l
0
, 7
2
0
0
5
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0
9
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0
0
3
6
0 -
1
0
1
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8 /
4
) T
Specification
2n (1)
, f
, f
, f
8
C32
(The counter functions as an 8-bit or a 16-bit pulse width modulator)
Content of the reload register is reloaded on the rising edge of PWM pulse and count-
ing continues.
The timer is not affected by a trigger that is generated during counting.
n / f
n
: setting value of the TAi register
j
f
: count source frequency
j
16
(2
-1) / f
fixed
j
= n x (m+1) / f
j
8
(2
-1) x (m+1) / f
j
m
: setting value of low-order bit address of the TAi register
n
: setting value of high-order bit address of the TAi register
both reload register and counter
(It is transferred to the counter at the next reload timing)
f o
4
9
5
15. Timer (Timer A)
0000
to FFFE
16
16
00
to FF
16
16
00
to FE
16
16

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