参数资料
型号: PIC16F872-E/SS
厂商: Microchip Technology
文件页数: 150/167页
文件大小: 0K
描述: IC MCU CMOS 20MHZ 2K FLSH 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x10b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
83
8048C–AVR–02/12
ATtiny43U
Figure 12-3 on page 83 shows a block diagram of the Output Compare unit.
Figure 12-3. Output Compare Unit, Block Diagram
The OCRnx Registers are double buffered when using any of the Pulse Width Modulation
(PWM) modes. For the normal and Clear Timer on Compare (CTC) modes of operation, the dou-
ble buffering is disabled. The double buffering synchronizes the update of the OCRnx Compare
Registers to either top or bottom of the counting sequence. The synchronization prevents the
occurrence of odd-length, non-symmetrical PWM pulses, thereby making the output glitch-free.
The OCRnx Register access may seem complex, but this is not case. When the double buffering
is enabled, the CPU has access to the OCRnx Buffer Register, and if double buffering is dis-
abled the CPU will access the OCRnx directly.
12.5.1
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 (nx) bit. Forcing Compare Match will not set the
OCFnx Flag or reload/clear the timer, but the OCnx pin will be updated as if a real Compare
Match had occurred (the COMnx[1:0] bits settings define whether the OCnx pin is set, cleared or
toggled).
12.5.2
Compare Match Blocking by TCNTn Write
All CPU write operations to the TCNTn Register will block any Compare Match that occur in the
next timer clock cycle, even when the timer is stopped. This feature allows OCRnx to be initial-
ized to the same value as TCNTn without triggering an interrupt when the Timer/Counter clock is
enabled.
12.5.3
Using the Output Compare Unit
Since writing TCNTn in any mode of operation will block all Compare Matches for one timer
clock cycle, there are risks involved when changing TCNTn when using the Output Compare
Unit, independently of whether the Timer/Counter is running or not. If the value written to TCNTn
OCFn x (Int.Req.)
= (8-bit Comparator )
OCRnx
OCnx
DATA BUS
TCNTn
WGMn[1:0]
Waveform Generator
top
FOCn
COMnx[1:0]
bottom
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