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| 型号： | MB9AF311MPMC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP80 |
| 封装： | 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件页数： | 14/114页 |
| 文件大小： | 1357K |
| 代理商： | MB9AF311MPMC |
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ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
110
16.9.3 Fast PWM Mode
The fast pulse width modulation or fast PWM mode (WGM13:0 = 5, 6, 7, 14, or 15) provides a high frequency PWM
waveform generation option. The fast PWM differs from the other PWM options by its single-slope operation. The counter
counts from BOTTOM to TOP then restarts from BOTTOM. In non-inverting compare output mode, the output compare
(OC1x) is cleared on the compare match between TCNT1 and OCR1x, and set at BOTTOM. In inverting compare output
mode output is set on compare match and cleared at BOTTOM. Due to the single-slope operation, the operating frequency
of the fast PWM mode can be twice as high as the phase correct and phase and frequency correct PWM modes that use
dual-slope operation. This high frequency makes the fast PWM mode well suited for power regulation, rectification, and DAC
applications. High frequency allows physically small sized external components (coils, capacitors), hence reduces total
system cost.
The PWM resolution for fast PWM can be fixed to 8-, 9-, or 10-bit, or defined by either ICR1 or OCR1A. The minimum
resolution allowed is 2-bit (ICR1 or OCR1A set to 0x0003), and the maximum resolution is 16-bit (ICR1 or OCR1A set to
MAX). The PWM resolution in bits can be calculated by using the following equation:
In fast PWM mode the counter is incremented until the counter value matches either one of the fixed values 0x00FF,
0x01FF, or 0x03FF (WGM13:0 = 5, 6, or 7), the value in ICR1 (WGM13:0 = 14), or the value in OCR1A (WGM13:0 = 15).
The counter is then cleared at the following timer clock cycle. The timing diagram for the fast PWM mode is shown in
Figure 16-7 on page 110. The figure shows fast PWM mode when OCR1A or ICR1 is used to define TOP. The TCNT1 value
is in the timing diagram shown as a histogram for illustrating the single-slope operation. The diagram includes non-inverted
and inverted PWM outputs. The small horizontal line marks on the TCNT1 slopes represent compare matches between
OCR1x and TCNT1. The OC1x interrupt flag will be set when a compare match occurs.
Figure 16-7. Fast PWM Mode, Timing Diagram
The Timer/Counter overflow flag (TOV1) is set each time the counter reaches TOP. In addition the OC1A or ICF1 flag is set
at the same timer clock cycle as TOV1 is set when either OCR1A or ICR1 is used for defining the TOP value. If one of the
interrupts are enabled, the interrupt handler routine can be used for updating the TOP and compare values.
When changing the TOP value the program must ensure that the new TOP value is higher or equal to the value of all of the
compare registers. If the TOP value is lower than any of the compare registers, a compare match will never occur between
the TCNT1 and the OCR1x. Note that when using fixed TOP values the unused bits are masked to zero when any of the
OCR1x registers are written.
RFPWM
TOP 1
+
()
log
2
()
log
---------------------------------
=
1234
5
TCNTn
(COMnx1:0 = 2)
OCnx
Period
OCRnx/ TOP Update and
TOVn Interrupt Flag Set and
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
67
8
(COMnx1:0 = 3)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MB9AF312KPMC1-G-JNE2 | 功能描述:ARM? Cortex?-M3 FM3 MB9A310K Microcontroller IC 32-Bit 40MHz 160KB (160K x 8) FLASH 52-LQFP (10x10) 制造商:cypress semiconductor corp 系列:FM3 MB9A310K 包装:托盘 零件状态:有效 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:40MHz 连接性:CSIO，I2C，LIN，UART/USART，USB 外设:DMA，LVD，POR，PWM，WDT I/O 数:36 程序存储容量:160KB（160K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:16K x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 5.5 V 数据转换器:A/D 8x12b 振荡器类型:内部 工作温度:-40°C ~ 105°C（TA） 封装/外壳:52-LQFP 供应商器件封装:52-LQFP（10x10） 标准包装:160 |
| MB9AF312KPMC-ES-E1 | 制造商:FUJITSU 功能描述: |
| MB9AF312KPMC-G-JNE1 | 制造商:FUJITSU 功能描述: |
| MB9AF312KPMC-G-JNE2 | 功能描述:ARM? Cortex?-M3 FM3 MB9A310K Microcontroller IC 32-Bit 40MHz 160KB (160K x 8) FLASH 48-LQFP (7x7) 制造商:cypress semiconductor corp 系列:FM3 MB9A310K 包装:托盘 零件状态:有效 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:40MHz 连接性:CSIO，I2C，LIN，UART/USART，USB 外设:DMA，LVD，POR，PWM，WDT I/O 数:36 程序存储容量:160KB（160K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:16K x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 5.5 V 数据转换器:A/D 8x12b 振荡器类型:内部 工作温度:-40°C ~ 105°C（TA） 封装/外壳:48-LQFP 供应商器件封装:48-LQFP（7x7） 标准包装:250 |
| MB9AF312KQN-ES-AWE2 | 制造商:FUJITSU 功能描述: |
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