參數(shù)資料
型號(hào)： PIC16C74A-04I/P
廠商： Microchip Technology
文件頁數(shù)： 88/114頁
文件大?。?/td> 0K
描述： IC MCU OTP 4KX14 A/D PWM 40DIP
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 10
系列： PIC® 16C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
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)： 33
程序存儲(chǔ)器容量： 7KB（4K x 14）
程序存儲(chǔ)器類型： OTP
RAM 容量： 192 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x8b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
配用： 444-1001-ND - DEMO BOARD FOR PICMICRO MCU
1997 Microchip Technology Inc.
DS30390E-page 75
PIC16C7X
EXAMPLE 10-2: PWM PERIOD AND DUTY
CYCLE CALCULATION
Desired PWM frequency is 78.125 kHz,
Fosc = 20 MHz
TMR2 prescale = 1
1/78.125 kHz= [(PR2) + 1] 4 1/20 MHz 1
12.8
s = [(PR2) + 1] 4 50 ns 1
PR2
= 63
Find the maximum resolution of the duty cycle that can
be used with a 78.125 kHz frequency and 20 MHz
oscillator:
1/78.125 kHz= 2
PWM RESOLUTION 1/20 MHz 1
12.8
s= 2PWM RESOLUTION 50 ns 1
256
= 2
PWM RESOLUTION
log(256) = (PWM Resolution) log(2)
8.0
= PWM Resolution
At most, an 8-bit resolution duty cycle can be obtained
from a 78.125 kHz frequency and a 20 MHz oscillator,
i.e., 0
≤ CCPR1L:CCP1CON<5:4> ≤ 255. Any value
greater than 255 will result in a 100% duty cycle.
In order to achieve higher resolution, the PWM fre-
quency must be decreased. In order to achieve higher
PWM frequency, the resolution must be decreased.
Table 10-3 lists example PWM frequencies and resolu-
tions for Fosc = 20 MHz. The TMR2 prescaler and PR2
values are also shown.
10.3.3
SET-UP FOR PWM OPERATION
The following steps should be taken when conguring
the CCP module for PWM operation:
1.
Set the PWM period by writing to the PR2 regis-
ter.
2.
Set the PWM duty cycle by writing to the
CCPR1L register and 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.
Congure the CCP1 module for PWM operation.
TABLE 10-3:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz
TABLE 10-4:
REGISTERS ASSOCIATED WITH CAPTURE, COMPARE, AND TIMER1
PWM Frequency
1.22 kHz
4.88 kHz
19.53 kHz
78.12 kHz
156.3 kHz
208.3 kHz
Timer Prescaler (1, 4, 16)
16
4
1111
PR2 Value
0xFF
0x3F
0x1F
0x17
Maximum Resolution (bits)
10
8
7
5.5
Address
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
0Bh,8Bh,
10Bh,18Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x 0000 000u
0Ch
PIR1
PSPIF(1,2) ADIF
RCIF(2)
TXIF(2)
SSPIF
CCP1IF
TMR2IF
TMR1IF 0000 0000 0000 0000
0Dh(2)
PIR2
—
CCP2IF ---- ---0 ---- ---0
8Ch
PIE1
PSPIE(1,2) ADIE
RCIE(2)
TXIE(2)
SSPIE
CCP1IE
TMR2IE
TMR1IE 0000 0000 0000 0000
8Dh(2)
PIE2
—
CCP2IE ---- ---0 ---- ---0
87h
TRISC
PORTC Data Direction Register
1111 1111 1111 1111
0Eh
TMR1L
Holding register for the Least Signicant Byte of the 16-bit TMR1 register
xxxx xxxx uuuu uuuu
0Fh
TMR1H
Holding register for the Most Signicant Byte of the 16-bit TMR1register
xxxx xxxx uuuu uuuu
10h
T1CON
—
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON --00 0000 --uu uuuu
15h
CCPR1L
Capture/Compare/PWM register1 (LSB)
xxxx xxxx uuuu uuuu
16h
CCPR1H
Capture/Compare/PWM register1 (MSB)
xxxx xxxx uuuu uuuu
17h
CCP1CON
—
CCP1X
CCP1Y
CCP1M3
CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000
1Bh(2)
CCPR2L
Capture/Compare/PWM register2 (LSB)
xxxx xxxx uuuu uuuu
1Ch(2)
CCPR2H
Capture/Compare/PWM register2 (MSB)
xxxx xxxx uuuu uuuu
1Dh(2)
CCP2CON
—
CCP2X
CCP2Y
CCP2M3
CCP2M2 CCP2M1 CCP2M0 --00 0000 --00 0000
Legend:
x
= unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by Capture and Timer1.
Note 1:
Bits PSPIE and PSPIF are reserved on the PIC16C73/73A/76, always maintain these bits clear.
2:
The PIC16C72 does not have a Parallel Slave Port, USART or CCP2 module, these bits are unimplemented, read as '0'.
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