參數(shù)資料
型號(hào)： PIC12F683T-E/MF
廠商： Microchip Technology
文件頁數(shù)： 157/176頁
文件大?。?/td> 0K
描述： IC MCU FLASH 2KX14 8DFN
Digi-Key 應(yīng)用說明： AN0005 PWM Example with Microchip's CCP Module
AN0005 Example Code
標(biāo)準(zhǔn)包裝： 3,300
系列： PIC® 12F
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 5
程序存儲(chǔ)器容量： 3.5KB（2K x 14）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 8-VDFN 裸露焊盤
包裝： 帶卷 (TR)
配用： AC164324-ND - MODULE SKT FOR MPLAB 8DFN/16QFN
XLT08DFN2-ND - SOCKET TRANSITION ICE 14DIP/8DFN
AC162058-ND - HEADER MPLAB ICD2 FOR PIC12F683
I3-DB12F683-ND - BOARD DAUGHTER ICEPIC3
XLT08DFN-ND - SOCKET TRANSITION ICE 8DFN
AC164032-ND - ADAPTER PICSTART PLUS 8DFN/DIP
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
2007 Microchip Technology Inc.
DS41211D-page 79
PIC12F683
11.3.1
PWM PERIOD
The PWM period is specified by the PR2 register of
Timer2. The PWM period can be calculated using the
formula of Equation 11-1.
EQUATION 11-1:
PWM PERIOD
When TMR2 is equal to PR2, the following three events
occur on the next increment cycle:
TMR2 is cleared
The CCP1 pin is set. (Exception: If the PWM duty
cycle = 0%, the pin will not be set.)
The PWM duty cycle is latched from CCPR1L into
CCPR1H.
11.3.2
PWM DUTY CYCLE
The PWM duty cycle is specified by writing a 10-bit
value to multiple registers: CCPR1L register and
DC1B<1:0> bits of the CCP1CON register. The
CCPR1L contains the eight MSbs and the CCP1<1:0>
bits of the CCP1CON register contain the two LSbs.
CCPR1L and DC1B<1:0> bits of the CCP1CON
register can be written to at any time. The duty cycle
value is not latched into CCPR1H until after the period
completes (i.e., a match between PR2 and TMR2
registers occurs). While using the PWM, the CCPR1H
register is read-only.
Equation 11-2 is used to calculate the PWM pulse
width.
Equation 11-3 is used to calculate the PWM duty cycle
ratio.
EQUATION 11-2:
PULSE WIDTH
EQUATION 11-3:
DUTY CYCLE RATIO
The CCPR1H register and a 2-bit internal latch are
used to double buffer the PWM duty cycle. This double
buffering is essential for glitchless PWM operation.
The 8-bit timer TMR2 register is concatenated with
either the 2-bit internal system clock (FOSC), or 2 bits of
the prescaler, to create the 10-bit time base. The system
clock is used if the Timer2 prescaler is set to 1:1.
When the 10-bit time base matches the CCPR1H and 2-
bit latch, then the CCP1 pin is cleared (see Figure 11-1).
11.3.3
PWM RESOLUTION
The resolution determines the number of available duty
cycles for a given period. For example, a 10-bit resolution
will result in 1024 discrete duty cycles, whereas an 8-bit
resolution will result in 256 discrete duty cycles.
The maximum PWM resolution is 10 bits when PR2 is
255. The resolution is a function of the PR2 register
value as shown by Equation 11-4.
EQUATION 11-4:
PWM RESOLUTION
TABLE 11-2:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 20 MHz)
TABLE 11-3:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 8 MHz)
Note:
The Timer2 postscaler (see Section 7.0
“Timer2 Module”) is not used in the
determination of the PWM frequency.
PWM Period
PR2
() 1
+
[] 4TOSC
=
(TMR2 Prescale Value)
Note:
If the pulse width value is greater than the
period the assigned PWM pin(s) will
remain unchanged.
Pulse Width
CCPR1L:CCP1CON<5:4>
()
=
TOSC
(TMR2 Prescale Value)
Duty Cycle Ratio
CCPR1L:CCP1CON<5:4>
()
4PR2
1
+
()
-----------------------------------------------------------------------
=
Resolution
4PR2
1
+
()
[]
log
2
()
log
------------------------------------------ bits
=
PWM Frequency
1.22 kHz
4.88 kHz
19.53 kHz
78.12 kHz
156.3 kHz
208.3 kHz
Timer Prescale (1, 4, 16)
16
4
1
PR2 Value
0xFF
0x3F
0x1F
0x17
Maximum Resolution (bits)
10
8
7
6.6
PWM Frequency
1.22 kHz
4.90 kHz
19.61 kHz
76.92 kHz
153.85 kHz
200.0 kHz
Timer Prescale (1, 4, 16)
16
4
1
PR2 Value
0x65
0x19
0x0C
0x09
Maximum Resolution (bits)
8
6
5
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PIC12F683T-I/MD 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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