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ATMEGA8-16PU 数据表(PDF) 69 Page - ATMEL Corporation |
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ATMEGA8-16PU 数据表(HTML) 69 Page - ATMEL Corporation |
69 / 308 page 69 2486T–AVR–05/08 ATmega8(L) 8-bit Timer/Counter0 Timer/Counter0 is a general purpose, single channel, 8-bit Timer/Counter module. The main features are: • Single Channel Counter • Frequency Generator • External Event Counter • 10-bit Clock Prescaler Overview A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 26. For the actual place- ment of I/O pins, refer to “Pin Configurations” on page 2. CPU accessible I/O Registers, including I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit loca- tions are listed in the “8-bit Timer/Counter Register Description” on page 72. Figure 26. 8-bit Timer/Counter Block Diagram Registers The Timer/Counter (TCNT0) is an 8-bit register. Interrupt request (abbreviated to Int. Req. in the figure) signals are all visible in the Timer Interrupt Flag Register (TIFR). All interrupts are individ- ually masked with the Timer Interrupt Mask Register (TIMSK). TIFR and TIMSK are not shown in the figure since these registers are shared by other timer units. The Timer/Counter can be clocked internally or via the prescaler, or by an external clock source on the T0 pin. The Clock Select logic block controls which clock source and edge the Timer/Counter uses to increment its value. The Timer/Counter is inactive when no clock source is selected. The output from the clock select logic is referred to as the timer clock (clk T0). Definitions Many register and bit references in this document are written in general form. A lower case “n” replaces the Timer/Counter number, in this case 0. However, when using the register or bit defines in a program, the precise form must be used i.e. TCNT0 for accessing Timer/Counter0 counter value and so on. The definitions in Table 33 are also used extensively throughout this datasheet. Timer/Counter TCNTn Control Logic = 0xFF count TOVn (Int.Req.) TCCRn Clock Select Tn Edge Detector ( From Prescaler ) clk Tn Table 33. Definitions BOTTOM The counter reaches the BOTTOM when it becomes 0x00 MAX The counter reaches its MAXimum when it becomes 0xFF (decimal 255) |
类似零件编号 - ATMEGA8-16PU |
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类似说明 - ATMEGA8-16PU |
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