atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 135

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

14.10.12 Output Compare Register 3 A – OCR3AH and OCR3AL
14.10.13 Output Compare Register 3 B – OCR3BH and OCR3BL
14.10.14 Output Compare Register 3 C – OCR3CH and OCR3CL
14.10.15 Input Capture Register 1 – ICR1H and ICR1L
14.10.16 Input Capture Register 3 – ICR3H and ICR3L
7766A–AVR–03/08
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.
The 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.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
See “Accessing 16-bit Registers” on page 108.
7
OCR3A[15:8]
OCR3A[7:0]
R/W
0
7
OCR3B[15:8]
OCR3B[7:0]
R/W
0
7
OCR3C[15:8]
OCR3C[7:0]
R/W
0
7
ICR1[15:8]
ICR1[7:0]
R/W
0
7
ICR3[15:8]
ICR3[7:0]
R/W
0
See “Accessing 16-bit Registers” on page 108.
6
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
3
R/W
0
3
R/W
0
3
R/W
0
3
R/W
0
3
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
ATmega32U4
0
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
OCR3AH
OCR3AL
OCR3BH
OCR3BL
OCR3CH
OCR3CL
ICR1H
ICR1L
ICR3H
ICR3L
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