DOC7707 datasheet(134/307 Pages) ETC1

134 / 307 page

134

7707F–AVR–11/10

AT90USB82/162

15.10.5

Output Compare Register 1 A – OCR1AH and OCR1AL

15.10.6

Output Compare Register 1 B – OCR1BH and OCR1BL

15.10.7

Output Compare Register 1 C – OCR1CH and OCR1CL

The Output Compare Registers contain a 16-bit value that is continuously compared with the

counter value (TCNTn). A match can be used to generate an Output Compare interrupt, or to

generate a waveform output on the OCnx pin.

The Output Compare Registers are 16-bit in size. To ensure that both the high and low bytes are

written simultaneously when the CPU writes to these registers, the access is performed using an

8-bit temporary High Byte Register (TEMP). This temporary register is shared by all the other

16-bit registers. See “Accessing 16-bit Registers” on page 109.

15.10.8

Input Capture Register 1 – ICR1H and ICR1L

IThe Input Capture is updated with the counter (TCNTn) value each time an event occurs on the

ICPn pin (or optionally on the Analog Comparator output for Timer/Counter1). The Input Capture

can be used for defining the counter TOP value.

The Input Capture Register is 16-bit in size. To ensure that both the high and low bytes are read

simultaneously when the CPU accesses these registers, the access is performed using an 8-bit

temporary High Byte Register (TEMP). This temporary register is shared by all the other 16-bit

registers. See “Accessing 16-bit Registers” on page 109.

15.10.9

Timer/Counter1 Interrupt Mask Register – TIMSK1

• Bit 5 – ICIEn: Timer/Countern, Input Capture Interrupt Enable

Bit

7654

OCR1A[15:8]

OCR1AH

OCR1A[7:0]

OCR1AL

Read/Write

R/WR/W

Initial Value

0000

Bit

7654

OCR1B[15:8]

OCR1BH

OCR1B[7:0]

OCR1BL

Read/Write

R/WR/W

Initial Value

0000

Bit

7654

OCR1C[15:8]

OCR1CH

OCR1C[7:0]

OCR1CL

Read/Write

R/WR/W

Initial Value

0000

Bit

7654

ICR1[15:8]

ICR1H

ICR1[7:0]

ICR1L

Read/Write

R/WR/W

Initial Value

0000

Bit

5432

–

–ICIE1

–

OCIE1C

OCIE1B

OCIE1A

TOIE1

TIMSK1

Read/Write

R/W

Initial Value

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