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| 型號(hào)： | MS80C31-12R |
| 廠商： | ATMEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 129/170頁(yè) |
| 文件大?。?/td> | 4133K |
| 代理商： | MS80C31-12R |
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61
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
Figure 11-7.
Compare Match Output Unit, Schematic (non-PWM Mode)
The general I/O port function is overridden by the Output Compare (OC0x) from the Waveform Generator if either
of the COM0x1:0 bits are set. However, the OC0x pin direction (input or output) is still controlled by the Data Direc-
tion Register (DDR) for the port pin. The Data Direction Register bit for the OC0x pin (DDR_OC0x) must be set as
output before the OC0x value is visible on the pin. The port override function is generally independent of the Wave-
form Generation mode, but there are some exceptions. See Table 11-2 on page 73, Table 11-3 on page 73 and
Table 11-4 on page 73 for details.
The design of the Output Compare pin logic allows initialization of the OC0x state before the output is enabled.
Note that some COM0x1:0 bit settings are reserved for certain modes of operation. See “Register Description” on
The COM0x1:0 bits have no effect on the Input Capture unit.
11.7.1
Compare Output Mode and Waveform Generation
The Waveform Generator uses the COM0x1:0 bits differently in normal, CTC, and PWM modes. For all modes,
setting the COM0x1:0 = 0 tells the Waveform Generator that no action on the OC0x Register is to be performed on
the next compare match. For compare output actions in the non-PWM modes refer to Table 11-2 on page 73. For
fast PWM mode refer to Table 11-3 on page 73, and for phase correct and phase and frequency correct PWM refer
A change of the COM0x1:0 bits state will have effect at the first compare match after the bits are written. For non-
PWM modes, the action can be forced to have immediate effect by using the 0x strobe bits.
11.8
Modes of Operation
The mode of operation, i.e., the behavior of the Timer/Counter and the Output Compare pins, is defined by the
combination of the Waveform Generation mode (WGM03:0) and Compare Output mode (COM0x1:0) bits. The
Compare Output mode bits do not affect the counting sequence, while the Waveform Generation mode bits do.
The COM0x1:0 bits control whether the PWM output generated should be inverted or not (inverted or non-inverted
PORT
DDR
DQ
OCnx
Pin
OCnx
DQ
Waveform
Generator
COMnx1
COMnx0
0
1
D
ATA
B
U
S
FOCnx
clk
I/O
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