參數(shù)資料
型號(hào)： R5F64112DFB
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 50 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁(yè)數(shù)： 66/84頁(yè)
文件大?。?/td> 1206K
代理商： R5F64112DFB
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
82
15.2.1 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 15-1 are also used extensively throughout the document.
15.2.2 Registers
The Timer/Counter (TCNT0) and output compare registers (OCR0A and OCR0B) are 8-bit registers. Interrupt request
(abbreviated to Int.Req. in the figure) signals are all visible in the timer interrupt flag register (TIFR0). All interrupts are
individually masked with the timer interrupt mask register (TIMSK0). TIFR0 and TIMSK0 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) are 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 Section 16.7.3 “Using the Output Compare Unit” on page 107 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.
15.3
Timer/Counter 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 (CS02:0) bits located in the Timer/Counter control register (TCCR0B). For
Table 15-1. Definitions
Parameter
Definition
BOTTOM
The counter reaches the 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 is dependent on the mode of operation.
相關(guān)PDF資料
PDF描述
R5F64165PFD 64-BIT, FLASH, MICROCONTROLLER, PQFP144
R5F64168HNFB 64-BIT, FLASH, MICROCONTROLLER, PQFP100
R5F64168HDFB 64-BIT, FLASH, MICROCONTROLLER, PQFP100
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R5F64168NFB 64-BIT, FLASH, MICROCONTROLLER, PQFP100
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