AT90PWM216-16SE ATMEL [ATMEL Corporation], AT90PWM216-16SE Datasheet - Page 99

• Manufacturer Part Number: AT90PWM216-16SE
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable flash
• Manufacturer: ATMEL [ATMEL Corporation]

7710D–AVR–08/09
Table 14-7
rect PWM mode.
Table 14-7.
Note:
• Bits 3, 2 – Res: Reserved Bits
These bits are reserved bits in the AT90PWM216/316 and will always read as zero.
• Bits 1:0 – WGM01:0: Waveform Generation Mode
Combined with the WGM02 bit found in the TCCR0B 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
unit are: Normal mode (counter), Clear Timer on Compare Match (CTC) mode, and two types of
Pulse Width Modulation (PWM) modes (see
Table 14-8.
Notes:
Mode
COM0B1
0
1
2
3
4
5
6
7
0
0
1
1
1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Com-
2. BOTTOM = 0x00
1. MAX
WGM02
pare Match is ignored, but the set or clear is done at TOP. See
page 94
shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to phase cor-
0
0
0
0
1
1
1
1
Compare Output Mode, Phase Correct PWM Mode
Waveform Generation Mode Bit Description
COM0B0
0
1
0
1
for more details.
WGM01
= 0xFF
0
0
1
1
0
0
1
1
Description
Normal port operation, OC0B disconnected.
Reserved
Clear OC0B on Compare Match when up-counting. Set OC0B on
Compare Match when down-counting.
Set OC0B on Compare Match when up-counting. Clear OC0B on
Compare Match when down-counting.
WGM00
Table
0
1
0
1
0
1
0
1
14-8. Modes of operation supported by the Timer/Counter
Timer/Count
er Mode of
Operation
Normal
PWM, Phase
Correct
CTC
Fast PWM
Reserved
PWM, Phase
Correct
Reserved
Fast PWM
“Modes of Operation” on page
OCRA
OCRA
OCRA
0xFF
0xFF
0xFF
TOP
–
–
AT90PWM216/316
Update of
Immediate
Immediate
OCRx at
(1)
TOP
TOP
TOP
TOP
“Phase Correct PWM Mode” on
–
–
91).
Set on
TOV Flag
BOTTOM
BOTTOM
MAX
MAX
MAX
TOP
–
–
(1)(2)
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