參數(shù)資料
型號： MQ80C32-25/883:D
廠商： TEMIC SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 25 MHz, MICROCONTROLLER, CQFP44
文件頁數(shù)： 83/109頁
文件大?。?/td> 10824K
60
ATtiny20 [DATASHEET]
8235E–AVR–03/2013
A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 11-1 on page 59. For the actual placement of I/O
pins, refer to Figure 1-1 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 locations are listed in the “Register Description” on page 69.
11.2.1 Registers
The Timer/Counter (TCNT0) and Output Compare Registers (OCR0A and OCR0B) are 8-bit registers. Interrupt request
(abbreviated to Int.Req. in Figure 11-1) signals are all visible in the Timer Interrupt Flag Register (TIFR). All interrupts are
individually masked with the Timer Interrupt Mask Register (TIMSK). TIFR and TIMSK are not shown in the figure.
The Timer/Counter can be clocked internally, 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 (or decrement) 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 (clkT0).
The double buffered Output Compare Registers (OCR0A and OCR0B) is compared with the Timer/Counter value at all
times. The result of the compare can be used by the Waveform Generator to generate a PWM or variable frequency
output on the Output Compare pins (OC0A and OC0B). See “Output Compare Unit” on page 61 for details. The Compare
Match event will also set the Compare Flag (OCF0A or OCF0B) which can be used to generate an Output Compare
interrupt request.
11.2.2 Definitions
Many register and bit references in this section are written in general form. A lower case “n” replaces the Timer/Counter
number, in this case 0. A lower case “x” replaces the Output Compare Unit, in this case Compare Unit A or Compare Unit
B. 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 11-1 are also used extensively throughout the document.
Table 11-1.
Definitions
11.3
Clock Sources
The Timer/Counter can be clocked by an internal or an external clock source. The clock source is selected by the Clock
Select logic which is controlled by the Clock Select (CS0[2:0]) bits located in the Timer/Counter Control Register
(TCCR0B). For details on clock sources and prescaler, see “Timer/Counter Prescaler” on page 103.
11.4
Counter Unit
The main part of the 8-bit Timer/Counter is the programmable bi-directional counter unit. Figure 11-2 on page 61 shows
a block diagram of the counter and its surroundings.
Constant
Description
BOTTOM
The counter reaches BOTTOM when it becomes 0x00
MAX
The counter reaches its MAXimum when it becomes 0xFF (decimal 255)
TOP
The counter reaches the TOP when it becomes equal to the highest value in the count sequence. The
TOP value can be assigned to be the fixed value 0xFF (MAX) or the value stored in the OCR0A Register.
The assignment depends on the mode of operation
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