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AT90USB646 Datasheet(PDF) 142 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 142 Page - ATMEL Corporation |
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142 / 456 page  142 7593L–AVR–09/12 AT90USB64/128 15.10.12 OCR3AH and OCR3AL – Output Compare Register 3 A 15.10.13 OCR3BH and OCR3BL – Output Compare Register 3 B 15.10.14 OCR3CH and OCR3CL – Output Compare Register 3 C 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 117. 15.10.15 ICR1H and ICR1L – Input Capture Register 1 15.10.16 ICR3H and ICR3L – Input Capture Register 3 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. See “Accessing 16-bit registers” on page 117. Bit 7 65 43 21 0 OCR3A[15:8] OCR3AH OCR3A[7:0] OCR3AL Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 Bit 7 65 43 21 0 OCR3B[15:8] OCR3BH OCR3B[7:0] OCR3BL Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 Bit 7 65 43 21 0 OCR3C[15:8] OCR3CH OCR3C[7:0] OCR3CL Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 Bit 7 65 43 21 0 ICR1[15:8] ICR1H ICR1[7:0] ICR1L Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 Bit 7 65 43 21 0 ICR3[15:8] ICR3H ICR3[7:0] ICR3L Read/write R/W R/W R/W R/W R/W R/W R/W R/W Initial value 00 00 00 00 |
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