參數(shù)資料
型號(hào): HCS100
廠商: Microchip Technology Inc.
英文描述: Bi-directional Authenticator(雙向文電鑒別碼)
中文描述: 雙向認(rèn)證者(雙向文電鑒別碼)
文件頁數(shù): 66/170頁
文件大?。?/td> 4191K
代理商: HCS100
PIC16F62X
DS40300C-page 64
Preliminary
2003 Microchip Technology Inc.
11.3
PWM Mode
In Pulse Width Modulation (PWM) mode, the CCP1 pin
produces up to a 10-bit resolution PWM output. Since
the CCP1 pin is multiplexed with the PORTB data latch,
the TRISB<3> bit must be cleared to make the CCP1
pin an output.
Figure 11-2 shows a simplified block diagram of the
CCP module in PWM mode.
For a step-by-step procedure on how to set up the CCP
module for PWM operation, see Section 11.3.3.
FIGURE 11-2:
SIMPLIFIED PWM BLOCK
DIAGRAM
A PWM output (Figure 11-3) has a time-base (period)
and a time that the output stays high (duty cycle). The
frequency of the PWM is the inverse of the period
(1/period).
FIGURE 11-3:
PWM OUTPUT
11.3.1
PWM PERIOD
The PWM period is specified by writing to the
PR2register. The PWM period can be calculated using
the following formula:
PWM period = [(PR2) + 1] 4 T
OSC
(TMR2 prescale value)
PWM frequency is defined as 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 PWM duty
cycle = 0%, the CCP1 pin will not be set)
The PWM duty cycle is latched from CCPR1L into
CCPR1H
Note:
Clearing the CCP1CON register will force
the CCP1 PWM output latch to the default
low level. This is not the PORTB I/O data
latch.
CCPR1L
CCPR1H (Slave)
Comparator
TMR2
Comparator
PR2
(Note 1)
R
Q
S
Duty cycle registers
CCP1CON<5:4>
Clear Timer,
CCP1 pin and
latch D.C.
TRISB<3>
RB3/CCP1
Note
1:
8-bit timer is concatenated with the 2-bit internal
Q clock, or 2 bits of the prescaler to create 10-bit
time-base.
Note:
The Timer2 postscaler (see Section 8.0) is
not used in the determination of the PWM
frequency. The postscaler could be used to
have an interrupt occur at a different fre-
quency than the PWM output.
Period
Duty Cycle
TMR2 = PR2
TMR2 = Duty Cycle
TMR2 = PR2
相關(guān)PDF資料
PDF描述
HCS120 Bi-directional Authenticator(雙向文電鑒別碼)
HCS405 Code Hopping Encoder(KeeLoq 碼編碼器)
HCS109HMSR Connector Dust Cap; For Use With:RJ45 Field Bus Hexagonal Jam Nut Receptacles, RJF71B; Accessory Type:RJ Field Bus; Approval Categories:UL94V-0 Flammability rated; Body Material:Metallic Housing; Color:Black; Series:RJ Field Bus
HCS109DMSR Radiation Hardened Dual JK Flip Flop
HCS109KMSR Radiation Hardened Dual JK Flip Flop
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HCS1009-049 制造商:ITT Interconnect Solutions 功能描述:CA121003-7
HCS1009-050 制造商:Sunbank (Meggitt) 功能描述:CCUP20-34
HCS1009-058 制造商:Glenair Inc 功能描述:MS25042-16DA
HCS1009-091 制造商:ITT Interconnect Solutions 功能描述:CB 3C 3#12 PIN RECP BOX
HCS1009-092 制造商:ITT Interconnect Solutions 功能描述:CB 3C 3#12 SKT RECP BOX