- 您现在的位置：买卖IC网 > PDF目录80366 > MB9AF314NBGL 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA112 PDF资料下载
参数资料
| 型号： | MB9AF314NBGL |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PBGA112 |
| 封装： | 0.80 MM PITCH, PLASTIC, FBGA-112 |
| 文件页数： | 12/114页 |
| 文件大小： | 1357K |
| 代理商： | MB9AF314NBGL |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页
109
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
16.9.2 Clear Timer on Compare Match (CTC) Mode
In Clear Timer on Compare or CTC mode (WGM13:0 = 4 or 12), the OCR1A or ICR1 register are used to manipulate the
counter resolution. In CTC mode the counter is cleared to zero when the counter value (TCNT1) matches either the OCR1A
(WGM13:0 = 4) or the ICR1 (WGM13:0 = 12). The OCR1A or ICR1 define the top value for the counter, hence also its
resolution. This mode allows greater control of the compare match output frequency. It also simplifies the operation of
counting external events.
The timing diagram for the CTC mode is shown in Figure 16-6. The counter value (TCNT1) increases until a compare match
occurs with either OCR1A or ICR1, and then counter (TCNT1) is cleared.
Figure 16-6. CTC Mode, Timing Diagram
An interrupt can be generated at each time the counter value reaches the TOP value by either using the OCF1A or ICF1 flag
according to the register used to define the TOP value. If the interrupt is enabled, the interrupt handler routine can be used
for updating the TOP value. However, changing the TOP to a value close to BOTTOM when the counter is running with none
or a low prescaler value must be done with care since the CTC mode does not have the double buffering feature. If the new
value written to OCR1A or ICR1 is lower than the current value of TCNT1, the counter will miss the compare match. The
counter will then have to count to its maximum value (0xFFFF) and wrap around starting at 0x0000 before the compare
match can occur. In many cases this feature is not desirable. An alternative will then be to use the fast PWM mode using
OCR1A for defining TOP (WGM13:0 = 15) since the OCR1A then will be double buffered.
For generating a waveform output in CTC mode, the OC1A output can be set to toggle its logical level on each compare
match by setting the Compare Output mode bits to toggle mode (COM1A1:0 = 1). The OC1A value will not be visible on the
port pin unless the data direction for the pin is set to output (DDR_OC1A = 1). The waveform generated will have a
maximum frequency of fOC1A = fclk_I/O/2 when OCR1A is set to zero (0x0000). The waveform frequency is defined by the
following equation:
The N variable represents the prescaler factor (1, 8, 64, 256, or 1024).
As for the normal mode of operation, the TOV1 flag is set in the same timer clock cycle that the counter counts from MAX to
0x0000.
12
TCNTn
(COMnA1:0 = 1)
OCnA
(Toggle)
Period
3
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
4
fOCnA
fclk_I/O
2N
×
1 OCRnA
+
()
×
-----------------------------------------------------
=
相关PDF资料 |
PDF描述 |
|---|---|
| MB9BF418SPMC | RISC MICROCONTROLLER, PQFP144 |
| M38802M1-XXXFS | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, CQCC64 |
| MAQ281CE | 16-BIT, MICROPROCESSOR, DMA64 |
| MAS281CS | 16-BIT, MICROPROCESSOR, DMA64 |
| M37730S2ASP | 16-BIT, 16 MHz, MICROCONTROLLER, PDIP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MB9AF314NBGL-GE1 | 制造商:FUJITSU 功能描述: 制造商:FUJITSU 功能描述:MCU 32BIT CORTEX-M3 FM3 112BGA 制造商:FUJITSU 功能描述:MCU, 32BIT, CORTEX-M3, FM3, 112BGA 制造商:FUJITSU 功能描述:MCU, 32BIT, CORTEX-M3, FM3, 112BGA, Controller Family/Series:ARM Cortex-M3, Core 制造商:FUJITSU 功能描述:MCU, 32BIT, CORTEX-M3, FM3, 112BGA, Controller Family/Series:ARM Cortex-M3, Core Size:32bit, No. of I/O's:83, Supply Voltage Min:2.7V, Supply Voltage Max:5.5V, Digital IC Case Style:BGA, No. of Pins:112, Program Memory Size:256KB, , RoHS Compliant: Yes |
| MB9AF314NPMC-GE1 | 制造商:FUJITSU 功能描述: |
| MB9AF314NPMC-G-JNE1 | 制造商:FUJITSU 功能描述: 制造商:FUJITSU 功能描述:MCU 32BIT CORTEX-M3 FM3 100LQFP 制造商:FUJITSU 功能描述:MCU, 32BIT, CORTEX-M3, FM3, 100LQFP, Controller Family/Series:ARM Cortex-M3, Cor |
| MB9AF316MAPMC-G-JNE2 | 制造商:Fujitsu 功能描述:Bulk |
| MB9AF316MPMC-G-JNE1 | 制造商:FUJITSU 功能描述:MCU 32BIT CORTEX-M3 FM3 80LQFP 制造商:FUJITSU 功能描述:MCU, 32BIT, CORTEX-M3, FM3, 80LQFP, Controller Family/Series:ARM Cortex-M3, Core |
发布紧急采购，3分钟左右您将得到回复。