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參數(shù)資料
| 型號(hào)： | MQ83C154XXX-16/883D |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁(yè)數(shù)： | 166/204頁(yè) |
| 文件大小： | 5687K |
| 代理商： | MQ83C154XXX-16/883D |
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64
ATtiny40 [DATASHEET]
8263B–AVR–01/2013
11.5.1
Force Output Compare
In non-PWM waveform generation modes, the match output of the comparator can be forced by writing a one to
the Force Output Compare (0x) bit. Forcing Compare Match will not set the OCF0x Flag or reload/clear the timer,
but the OC0x pin will be updated as if a real Compare Match had occurred (the COM0x[1:0] bits settings define
whether the OC0x pin is set, cleared or toggled).
11.5.2
Compare Match Blocking by TCNT0 Write
All CPU write operations to the TCNT0 Register will block any Compare Match that occur in the next timer clock
cycle, even when the timer is stopped. This feature allows OCR0x to be initialized to the same value as TCNT0
without triggering an interrupt when the Timer/Counter clock is enabled.
11.5.3
Using the Output Compare Unit
Since writing TCNT0 in any mode of operation will block all Compare Matches for one timer clock cycle, there are
risks involved when changing TCNT0 when using the Output Compare Unit, independently of whether the
Timer/Counter is running or not. If the value written to TCNT0 equals the OCR0x value, the Compare Match will be
missed, resulting in incorrect waveform generation. Similarly, do not write the TCNT0 value equal to BOTTOM
when the counter is down-counting.
The setup of the OC0x should be performed before setting the Data Direction Register for the port pin to output.
The easiest way of setting the OC0x value is to use the Force Output Compare (0x) strobe bits in Normal mode.
The OC0x Registers keep their values even when changing between Waveform Generation modes.
Be aware that the COM0x[1:0] bits are not double buffered together with the compare value. Changing the
COM0x[1:0] bits will take effect immediately.
11.6
Compare Match Output Unit
The Compare Output mode (COM0x[1:0]) bits have two functions. The Waveform Generator uses the COM0x[1:0]
bits for defining the Output Compare (OC0x) state at the next Compare Match. Also, the COM0x[1:0] bits control
the OC0x pin output source. Figure 11-4 on page 65 shows a simplified schematic of the logic affected by the
COM0x[1:0] bit setting. The I/O Registers, I/O bits, and I/O pins in the figure are shown in bold. Only the parts of
the general I/O Port Control Registers (DDR and PORT) that are affected by the COM0x[1:0] bits are shown. When
referring to the OC0x state, the reference is for the internal OC0x Register, not the OC0x pin. If a system reset
occur, the OC0x Register is reset to “0”.
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