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8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
16.12.7
OCR1BH and OCR1BL – Output Compare Register1 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 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 113.
16.12.8
OCR3AH and OCR3AL – Output Compare Register3 A
16.12.9
OCR3BH and OCR3BL – Output Compare Register3 B
The Output Compare Registers contain a 16-bit value that is continuously compared with the
counter value (TCNT3). 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 113.
16.12.10 ICR1H and ICR1L – Input Capture Register 1
The Input Capture is updated with the counter (TCNT1) 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
Bit
76543210
(0x8B)
OCR1B[15:8]
OCR1BH
(0x8A)
OCR1B[7:0]
OCR1BL
Read/Write
R/W
Initial Value
00000000
Bit
76543210
(0x99)
OCR3A[15:8]
OCR3AH
(0x98)
OCR3A[7:0]
OCR3AL
Read/Write
R/W
Initial Value
00000000
Bit
76543210
(0x9B)
OCR3B[15:8]
OCR3BH
(0x9A)
OCR3B[7:0]
OCR3BL
Read/Write
R/W
Initial Value
00000000
Bit
76543210
(0x87)
ICR1[15:8]
ICR1H
(0x86)
ICR1[7:0]
ICR1L
Read/Write
R/W
Initial Value
00000000
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