Datasheet

21.11.5 OCR1AL – Output Compare Register 1 A Low byte

Name: OCR1AL

Offset: 0x2A

Reset: 0x00

Property: When addressing I/O Registers as data space the offset address is 0x4A

When using the I/O specific commands IN and OUT, the I/O addresses 0x00 - 0x3F must be used. When

addressing I/O Registers as data space using LD and ST instructions, 0x20 must be added to these offset

addresses.

Bit 7 6 5 4 3 2 1 0

OCR1AL[7:0]

Access

R/W R/W R/W R/W R/W R/W R/W R/W

Reset 0 0 0 0 0 0 0 0

Bits 7:0 – OCR1AL[7:0] Output Compare 1 A Low byte

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

value (TCNT1). A match can be used to generate an Output Compare interrupt, or to generate a

waveform output on the OC1x 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. Refer to

Accessing 16-bit Registers for details.

AVR 8-Bit Microcontroller

16-bit Timer/Counter1

Datasheet Complete

40001974A-page 142