參數(shù)資料
型號(hào): PIC16CR76-I/SS
廠商: Microchip Technology
文件頁數(shù): 48/172頁
文件大?。?/td> 0K
描述: IC PIC MCU 8KX14 28SSOP
標(biāo)準(zhǔn)包裝: 47
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲(chǔ)器容量: 14KB(8K x 14)
程序存儲(chǔ)器類型: ROM
RAM 容量: 368 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SSOP(0.209",5.30mm 寬)
包裝: 管件
2007 Microchip Technology Inc.
DS39599G-page 139
PIC18F2220/2320/4220/4320
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 opera-
tion. When the CCPR1H and 2-bit latch match TMR2,
concatenated with an internal 2-bit Q clock or two bits
of the TMR2 prescaler, the CCP1 pin is cleared. The
maximum PWM resolution (bits) for a given PWM
frequency is given by the following equation.
EQUATION 15-3:
15.5.3
SETUP FOR PWM OPERATION
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
Set the PWM period by writing to the PR2 register.
2.
Set the PWM duty cycle by writing to the
CCPR1L register and the CCP1CON<5:4> bits.
3.
Make the CCP1 pin an output by clearing the
TRISC<2> bit.
4.
Set the TMR2 prescale value and enable Timer2
by writing to T2CON.
5.
Configure the CCP1 module for PWM operation.
TABLE 15-4:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz
TABLE 15-5:
REGISTERS ASSOCIATED WITH PWM AND TIMER2
Note:
If the PWM duty cycle value is longer than
the PWM period, the CCP1 pin will not be
cleared.
PWM Resolution (max) =
FOSC
FPWM
log
log(2)
bits
PWM Frequency
2.44 kHz
9.77 kHz
39.06 kHz
156.25 kHz
312.50 kHz
416.67 kHz
Timer Prescaler (1, 4, 16)
16
41111
PR2 Value
FFh
3Fh
1Fh
17h
Maximum Resolution (bits)
10
8
7
6.58
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets
INTCON
GIE/GIEH PEIE/GIEL
TMR0IE
INT0IE
RBIE
TMR0IF
INT0IF
RBIF
0000 000x 0000 000u
PIR1
PSPIF(1)
ADIF
RCIF
TXIF
SSPIF
CCP1IF
TMR2IF
TMR1IF 0000 0000 0000 0000
PIE1
PSPIE(1)
ADIE
RCIE
TXIE
SSPIE
CCP1IE
TMR2IE
TMR1IE 0000 0000 0000 0000
IPR1
PSPIP(1)
ADIP
RCIP
TXIP
SSPIP
CCP1IP
TMR2IP
TMR1IP 1111 1111 1111 1111
TRISC
PORTC Data Direction Register
1111 1111 1111 1111
TMR2
Timer2 Module Register
0000 0000 0000 0000
PR2
Timer2 Module Period Register
1111 1111 1111 1111
T2CON
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000
CCPR1L
Capture/Compare/PWM Register 1 (LSB)
xxxx xxxx uuuu uuuu
CCPR1H
Capture/Compare/PWM Register 1 (MSB)
xxxx xxxx uuuu uuuu
CCP1CON
DC1B1
DC1B0
CCP1M3
CCP1M2 CCP1M1
CCP1M0 --00 0000 --00 0000
CCPR2L
Capture/Compare/PWM Register 2 (LSB)
xxxx xxxx uuuu uuuu
CCPR2H
Capture/Compare/PWM Register 2 (MSB)
xxxx xxxx uuuu uuuu
CCP2CON
DC2B1
DC2B0
CCP2M3
CCP2M2 CCP2M1
CCP2M0 --00 0000 --00 0000
OSCCON
IDLEN
IRCF2
IRCF1
IRCF0
OSTS
IOFS
SCS1
SCS0
0000 qq00 0000 qq00
Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used by PWM and Timer2.
Note 1: The PSPIF, PSPIE and PSPIP bits are reserved on the PIC18F2X20 devices; always maintain these bits clear.
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