參數(shù)資料
型號: TS80C32X2-ELCR
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MICROCONTROLLER, PQFP44
封裝: PLASTIC, QFP-44
文件頁數(shù): 81/83頁
文件大?。?/td> 8336K
代理商: TS80C32X2-ELCR
92
7707F–AVR–11/10
AT90USB82/162
clear
Clear TCNT0 (set all bits to zero).
clk
Tn
Timer/Counter clock, referred to as clk
T0 in the following.
top
Signalize that TCNT0 has reached maximum value.
bottom
Signalize that TCNT0 has reached minimum value (zero).
Depending of the mode of operation used, the counter is cleared, incremented, or decremented
at each timer clock (clk
T0). clkT0 can be generated from an external or internal clock source,
selected by the Clock Select bits (CS02:0). When no clock source is selected (CS02:0 = 0) the
timer is stopped. However, the TCNT0 value can be accessed by the CPU, regardless of
whether clk
T0 is present or not. A CPU write overrides (has priority over) all counter clear or
count operations.
The counting sequence is determined by the setting of the WGM01 and WGM00 bits located in
the Timer/Counter Control Register (TCCR0A) and the WGM02 bit located in the Timer/Counter
Control Register B (TCCR0B). There are close connections between how the counter behaves
(counts) and how waveforms are generated on the Output Compare outputs OC0A and OC0B.
For more details about advanced counting sequences and waveform generation, see “Modes of
The Timer/Counter Overflow Flag (TOV0) is set according to the mode of operation selected by
the WGM02:0 bits. TOV0 can be used for generating a CPU interrupt.
14.4
Output Compare Unit
The 8-bit comparator continuously compares TCNT0 with the Output Compare Registers
(OCR0A and OCR0B). Whenever TCNT0 equals OCR0A or OCR0B, the comparator signals a
match. A match will set the Output Compare Flag (OCF0A or OCF0B) at the next timer clock
cycle. If the corresponding interrupt is enabled, the Output Compare Flag generates an Output
Compare interrupt. The Output Compare Flag is automatically cleared when the interrupt is exe-
cuted. Alternatively, the flag can be cleared by software by writing a logical one to its I/O bit
location. The Waveform Generator uses the match signal to generate an output according to
operating mode set by the WGM02:0 bits and Compare Output mode (COM0x1:0) bits. The max
and bottom signals are used by the Waveform Generator for handling the special cases of the
extreme values in some modes of operation (“Modes of Operation” on page 95).
Figure 14-3 shows a block diagram of the Output Compare unit.
相關PDF資料
PDF描述
TS80C31X2-VJBB 8-BIT, 40 MHz, MICROCONTROLLER, PQCC44
TSC80C31-16KAD 8-BIT, 16 MHz, MICROCONTROLLER, PDIP40
TSC80C31-40JDB 8-BIT, 40 MHz, MICROCONTROLLER, PQFP44
TSC80C31-12LFR 8-BIT, 12 MHz, MICROCONTROLLER, PQFP44
TSC80C31-20LFD 8-BIT, 20 MHz, MICROCONTROLLER, PQFP44
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