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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATMEGA640 데이터시트(PDF) 154 Page - Microchip Technology |
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ATMEGA640 데이터시트(HTML) 154 Page - Microchip Technology |
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154 / 436 page  154 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A 17.11 Register Description 17.11.1 TCCR1A – Timer/Counter 1 Control Register A 17.11.2 TCCR3A – Timer/Counter 3 Control Register A 17.11.3 TCCR4A – Timer/Counter 4 Control Register A 17.11.4 TCCR5A – Timer/Counter 5 Control Register A • Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A • Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B • Bit 3:2 – COMnC1:0: Compare Output Mode for Channel C The COMnA1:0, COMnB1:0, and COMnC1:0 control the output compare pins (OCnA, OCnB, and OCnC respec- tively) behavior. If one or both of the COMnA1:0 bits are written to one, the OCnA output overrides the normal port functionality of the I/O pin it is connected to. If one or both of the COMnB1:0 bits are written to one, the OCnB out- put overrides the normal port functionality of the I/O pin it is connected to. If one or both of the COMnC1:0 bits are written to one, the OCnC output overrides the normal port functionality of the I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit corresponding to the OCnA, OCnB or OCnC pin must be set in order to enable the output driver. When the OCnA, OCnB or OCnC is connected to the pin, the function of the COMnx1:0 bits is dependent of the WGMn3:0 bits setting. Table 17-3 on page 155 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to a normal or a CTC mode (non-PWM). Bit 7 6 543 2 1 0 (0x80) COM1A1 COM1A0 COM1B1 COM1B0 COM1C1 COM1C0 WGM11 WGM10 TCCR1A Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 543 2 1 0 (0x90) COM3A1 COM3A0 COM3B1 COM3B0 COM3C1 COM3C0 WGM31 WGM30 TCCR3A Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 543 2 1 0 (0xA0) COM4A1 COM4A0 COM4B1 COM4B0 COM4C1 COM4C0 WGM41 WGM40 TCCR4A Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 543 2 1 0 (0x120) COM5A1 COM5A0 COM5B1 COM5B0 COM5C1 COM5C0 WGM51 WGM50 TCCR5A Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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