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ATmega32A Datasheet(PDF) 114 Page - ATMEL Corporation

Part # ATmega32A
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  352 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32A Datasheet(HTML) 114 Page - ATMEL Corporation

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114
8155B–AVR–07/09
ATmega32A
TCCR1A is written when operating in a PWM mode. When writing a logical one to the
FOC1A/FOC1B bit, an immediate compare match is forced on the Waveform Generation unit.
The OC1A/OC1B output is changed according to its COM1x1:0 bits setting. Note that the
FOC1A/FOC1B bits are implemented as strobes. Therefore it is the value present in the
COM1x1:0 bits that determine the effect of the forced compare.
A FOC1A/FOC1B strobe will not generate any interrupt nor will it clear the timer in Clear Timer
on Compare match (CTC) mode using OCR1A as TOP.
The FOC1A/FOC1B bits are always read as zero.
• Bit 1:0 – WGM11:0: Waveform Generation Mode
Combined with the WGM13:2 bits found in the TCCR1B Register, these bits control the counting
sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-
form generation to be used, see Table 16-5. Modes of operation supported by the Timer/Counter
unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode, and three types
of Pulse Width Modulation (PWM) modes. (See “Modes of Operation” on page 103.)
Note:
1. The CTC1 and PWM11:0 bit definition names are obsolete. Use the
WGM12:0 definitions. However, the functionality and
location of these bits are compatible with previous versions of the timer.
16.10.2
TCCR1B – Timer/Counter1 Control Register B
Table 16-5.
Waveform Generation Mode Bit Description
(1)
Mode
WGM13
WGM12
(CTC1)
WGM11
(PWM11)
WGM10
(PWM10)
Timer/Counter Mode of
Operation
TOP
Update of
OCR1
x
TOV1 Flag Set
on
00
0
0
0
Normal
0xFFFF
Immediate
MAX
10
0
0
1
PWM, Phase Correct, 8-bit
0x00FF
TOP
BOTTOM
20
0
1
0
PWM, Phase Correct, 9-bit
0x01FF
TOP
BOTTOM
30
0
1
1
PWM, Phase Correct, 10-bit
0x03FF
TOP
BOTTOM
40
1
0
0
CTC
OCR1A
Immediate
MAX
50
1
0
1
Fast PWM, 8-bit
0x00FF
BOTTOM
TOP
60
1
1
0
Fast PWM, 9-bit
0x01FF
BOTTOM
TOP
70
1
1
1
Fast PWM, 10-bit
0x03FF
BOTTOM
TOP
81
0
0
0
PWM, Phase and Frequency Correct
ICR1
BOTTOM
BOTTOM
91
0
0
1
PWM, Phase and Frequency Correct
OCR1A
BOTTOM
BOTTOM
10
1
0
1
0
PWM, Phase Correct
ICR1
TOP
BOTTOM
11
1
0
1
1
PWM, Phase Correct
OCR1A
TOP
BOTTOM
12
1
1
0
0
CTC
ICR1
Immediate
MAX
13
1
1
0
1
Reserved
–
–
–
14
1
1
1
0
Fast PWM
ICR1
BOTTOM
TOP
15
1
1
1
1
Fast PWM
OCR1A
BOTTOM
TOP
Bit
7
6
5
4
3
210
ICNC1
ICES1
–
WGM13
WGM12
CS12
CS11
CS10
TCCR1B
Read/Write
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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