AT90PWM216-16SE ATMEL [ATMEL Corporation], AT90PWM216-16SE Datasheet - Page 101
AT90PWM216-16SE
Manufacturer Part Number
AT90PWM216-16SE
Description
8-bit Microcontroller with 16K Bytes In-System Programmable flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT90PWM216-16SE.pdf
(360 pages)
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14.8.3
14.8.4
14.8.5
14.8.6
7710D–AVR–08/09
Timer/Counter Register – TCNT0
Output Compare Register A – OCR0A
Output Compare Register B – OCR0B
Timer/Counter Interrupt Mask Register – TIMSK0
Table 14-9.
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT0 Register blocks (removes) the Compare
Match on the following timer clock. Modifying the counter (TCNT0) while the counter is running,
introduces a risk of missing a Compare Match between TCNT0 and the OCR0x Registers.
The Output Compare Register A contains an 8-bit value that is continuously compared with the
counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC0A pin.
The Output Compare Register B contains an 8-bit value that is continuously compared with the
counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC0B pin.
• Bits 7..3 – Res: Reserved Bits
These bits are reserved bits in the AT90PWM216/316 and will always read as zero.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
CS02
1
1
1
1
CS01
0
0
1
1
Clock Select Bit Description (Continued)
R/W
R/W
R/W
R
7
0
7
0
7
0
7
–
0
CS00
0
1
0
1
R/W
R/W
R/W
Description
clk
clk
External clock source on T0 pin. Clock on falling edge.
External clock source on T0 pin. Clock on rising edge.
R
6
–
0
6
0
6
0
6
0
I/O
I/O
/256 (From prescaler)
/1024 (From prescaler)
R/W
R/W
R/W
R
5
–
0
5
0
5
0
5
0
R/W
R/W
R/W
R
4
–
0
4
0
4
0
4
0
OCR0A[7:0]
OCR0B[7:0]
TCNT0[7:0]
R/W
R/W
R/W
R
3
–
0
3
0
3
0
3
0
OCIE0B
R/W
R/W
R/W
R/W
AT90PWM216/316
2
0
2
0
2
0
2
0
OCIE0A
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0
TOIE0
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
TIMSK0
OCR0A
OCR0B
TCNT0
101
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