ATmega16A datasheet(114/352 Pages) ATMEL

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114

8154B–AVR–07/09

ATmega16A

ensure that both the high and Low bytes are read and written 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 91.

Modifying the counter (TCNT1) while the counter is running introduces a risk of missing a com-

pare match between TCNT1 and one of the OCR1x Registers.

Writing to the TCNT1 Register blocks (removes) the compare match on the following timer clock

for all compare units.

16.11.4

OCR1AH and OCR1AL – Output Compare Register 1 A

16.11.5

OCR1BH and OCR1BL – Output Compare Register 1 B

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. See “Accessing 16-bit Registers” on page 91.

16.11.6

ICR1H and ICR1L – Input Capture Register 1

The Input Capture is updated with the counter (TCNT1) value each time an event occurs on the

ICP1 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 91.

Bit

765

432

OCR1A[15:8]

OCR1AH

OCR1A[7:0]

OCR1AL

Read/Write

R/W

Initial Value

Bit

765

432

OCR1B[15:8]

OCR1BH

OCR1B[7:0]

OCR1BL

Read/Write

R/W

Initial Value

Bit

765

432

ICR1[15:8]

ICR1H

ICR1[7:0]

ICR1L

Read/Write

R/W

Initial Value

ATmega16A Datasheet(PDF) 114 Page - ATMEL Corporation

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