參數(shù)資料
型號(hào): PIC16CR76T-I/SS
廠商: Microchip Technology
文件頁數(shù): 52/172頁
文件大小: 0K
描述: IC PIC MCU 8KX14 28SSOP
標(biāo)準(zhǔn)包裝: 2,100
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: 帶卷 (TR)
2007 Microchip Technology Inc.
DS39599G-page 143
PIC18F2220/2320/4220/4320
16.4
Enhanced PWM Mode
The Enhanced PWM mode provides additional PWM
output options for a broader range of control applica-
tions. The module is an upwardly compatible version of
the standard CCP module and offers up to four outputs,
designated P1A through P1D. Users are also able to
select the polarity of the signal (either active-high or
active-low). The module’s output mode and polarity are
configured
by
setting
the
P1M1:P1M0
and
CCP1M3:CCP1M0 bits of the CCP1CON register
(CCP1CON<7:6> and CCP1CON<3:0>, respectively).
Figure 16-1 shows a simplified block diagram of PWM
operation. All control registers are double-buffered and
are loaded at the beginning of a new PWM cycle (the
period boundary when Timer2 resets) in order to pre-
vent glitches on any of the outputs. The exception is the
PWM Delay register, ECCP1DEL, which is loaded at
either the duty cycle boundary or the boundary period
(whichever comes first). Because of the buffering, the
module waits until the assigned timer resets instead of
starting immediately. This means that enhanced PWM
waveforms do not exactly match the standard PWM
waveforms but are instead offset by one full instruction
cycle (4 TOSC).
As before, the user must manually configure the
appropriate TRISD bits for output.
16.4.1
PWM OUTPUT CONFIGURATIONS
The P1M1:P1M0 bits in the CCP1CON register allow
one of four configurations:
Single Output
Half-Bridge Output
Full-Bridge Output, Forward mode
Full-Bridge Output, Reverse mode
The Single Output mode is the Standard PWM mode
discussed in Section 15.5 “PWM Mode”. The Half-
Bridge and Full-Bridge Output modes are covered in
detail in the sections that follow.
The general relationship of the outputs in all
configurations is summarized in Figure 16-2.
FIGURE 16-1:
SIMPLIFIED BLOCK DIAGRAM OF THE ENHANCED PWM MODULE
CCPR1L
CCPR1H (Slave)
Comparator
TMR2
Comparator
PR2
(Note 1)
RQ
S
Duty Cycle Registers
CCP1CON<5:4>
Clear Timer,
set CCP1 pin and
latch D.C.
Note: The 8-bit timer TMR2 register is concatenated with the 2-bit internal Q clock or 2 bits of the prescaler to create the 10-bit time base.
TRISD<2>
RC2/CCP1/P1A
TRISD<5>
RD5/PSP5/P1B
TRISD<6>
RD6/PSP6/P1C
TRISD<7>
RD7/PSP7/P1D
Output
Controller
P1M1<1:0>
2
CCP1M<3:0>
4
PWM1CON
CCP1/P1A
P1B
P1C
P1D
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