- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄357780 > EM6617VVVST11A 4-BIT, MROM, 0.032768 MHz, RISC MICROCONTROLLER PDF資料下載
參數(shù)資料
| 型號： | EM6617VVVST11A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.032768 MHz, RISC MICROCONTROLLER |
| 封裝： | STICKY TAPE |
| 文件頁數(shù)： | 26/66頁 |
| 文件大?。?/td> | 759K |
| 代理商： | EM6617VVVST11A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁
EM6617-1
EM Microelectronic-Marin SA , 3/99 Rev. B/258
26
For instance, loading the counter in up count mode with hex 000 and the comparator with hex C52 which will
be identified as :
- bits[11:10] are limiting the counter to limits to 4 bits length, =03
- bits [9:4] are the unused counter bits = hex 05 (bin 000101),
- bits [3:0] (comparator value = 2).
(BitSel[1,0])
(number of PWM pulses)
(length of PWM pulse)
Thus after 5 PWM-pulses of 2 clocks cycles length the Counter generates an
IRQComp
and stops.
The same example with SelIntFull=0 (limited bit compare) will produce an unlimited number of PWM at a length
of 2 clock cycles.
8.5.1 How the PWM Generator works.
For Up Count Mode
; Setting the counter in up count and PWM mode the PB[3] PWM output is defined to be 0
(
EnComp
=0 forces the PWM output to 0 in upcount mode, 1 in downcount). Each Roll Over will set the output
to ‘1’ and each Compare Match will set it back to ‘0’. The Compare Match for PWM always only works on the
defined counter length. This, independent of the SelIntFull setting which is valid only for the IRQ generation.
Refer also to the compare setup in chapter 8.4.
In above example the PWM starts counting up on hex 0,
2 cycles later compare match -> PWM to ‘0’,
14 cycles later roll over -> PWM to ‘1’
2 cycles later compare match -> PWM to ‘0’ , etc. until the completion of the 5 pulses.
The normal IRQ generation remains on during PWM output. If no IRQ’s are wanted, the corresponding masks
need to be set.
In Down Count Mode
everything is inverted. The PWM output starts with the ‘1’ value. Each Roll Over will set
the output to ‘0’ and each Compare Match will set it back to ‘1’. For limited pulse generation one must load the
complementary pulse number value. I.e. for 5 pulses counting on 4 bits load bits[9 :4] with hex 3A (bin 111010).
8.5.2 PWM Characteristics
PWM resolution is
the minimal signal period is
the maximum signal period is : 1024 x Fmin*
the minimal pulse width is
* This values are for Fmax or Fmin derived from the internal system clock (32kHz). Much shorter (and longer)
PWM pulses can be achieved by using the port A as frequency input.
: 10bits (1024 steps), 8bits (256 steps), 6bits (64 steps) or 4 bits (16 steps)
: 16 (4-bit) x Fmax*
-> 16 x 1/Ck[15]
-> 1024 x 1/Ck[1]
: 1 bit
-> 1 x 1/Ck[15]
-> 977 μs
-> 1024 s
-> 61 μs
(32 KHz)
(32 KHz)
(32 KHz)
One must not use a compare value of hex 0 in up count mode nor a value of hex 3FF (or FF,3F, F if limited bit
compare) in downcount mode.
Figure 20. PWM Output in Up Count Mode
Data+2
Data+1
Data-1
Data
...
001
000
03F
03E
PWM output
IRQComp
IRQCount0
Compare
Roll-over
Count[9 :0]
Clock
Figure 21. PWM Output in Down Count Mode
Data-2
Data-1
Data+1
Data
...
3FE
3FF
000
001
PWM output
IRQComp
IRQCount0
Compare
Roll-over
Count[9 :0]
Clock
相關PDF資料 |
PDF描述 |
|---|---|
| EMCL12M2H-187.5103MTR | CRYSTAL OSCILLATOR, CLOCK, 187.5103 MHz, LVPECL OUTPUT |
| EMDS22N2J-156.250M | CRYSTAL OSCILLATOR, CLOCK, 156.25 MHz, LVDS OUTPUT |
| EMDS23C2H-10.000M | CRYSTAL OSCILLATOR, CLOCK, 10 MHz, LVDS OUTPUT |
| EMDS23E2H-77.760MTR | CRYSTAL OSCILLATOR, CLOCK, 77.76 MHz, LVDS OUTPUT |
| EMIF4-100FCD4 | EMI FILTER/TVS ARRAY |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EM6617WP11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WP27 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WS11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WS27 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WW11 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
發(fā)布緊急采購，3分鐘左右您將得到回復。