參數(shù)資料
型號(hào)： PIC16CR76T-I/SO
廠商： Microchip Technology
文件頁數(shù)： 62/172頁
文件大?。?/td> 0K
描述： IC PIC MCU 8KX14 28SOIC
標(biāo)準(zhǔn)包裝： 1,600
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-SOIC（0.295"，7.50mm 寬）
包裝： 帶卷 (TR)
PIC18F2220/2320/4220/4320
DS39599G-page 152
2007 Microchip Technology Inc.
16.4.7
SETUP FOR PWM OPERATION
The following steps should be taken when configuring
the ECCP module for PWM operation:
1.
Configure the PWM pins P1A and P1B (and
P1C and P1D, if used) as inputs by setting the
corresponding TRISC and TRISD bits.
2.
Set the PWM period by loading the PR2 register.
3.
Configure the ECCP module for the desired
PWM mode and configuration by loading the
CCP1CON register with the appropriate values:
Select one of the available output
configurations and direction with the
P1M1:P1M0 bits.
Select the polarities of the PWM output
signals with the CCP1M3:CCP1M0 bits.
4.
Set the PWM duty cycle by loading the CCPR1L
register and CCP1CON<5:4> bits.
5.
For Half-Bridge Output mode, set the dead band
delay by loading PWM1CON<6:0> with the
appropriate value.
6.
If auto-shutdown operation is required, load the
ECCPAS register:
Select the auto-shutdown sources using the
ECCPAS<2:0> bits.
Select the shutdown states of the PWM
output pins using PSSAC1:PSSAC0 and
PSSBD1:PSSBD0 bits.
Set the ECCPASE bit (ECCPAS<7>).
Configure the comparators using the CMCON
register.
Configure the comparator inputs as analog
inputs.
7.
If auto-restart operation is required, set the
PRSEN bit (PWM1CON<7>).
8.
Configure and start TMR2:
Clear the TMR2 interrupt flag bit by clearing
the TMR2IF bit (PIR1<1>).
Set the TMR2 prescale value by loading the
T2CKPS bits (T2CON<1:0>).
Enable Timer2 by setting the TMR2ON bit
(T2CON<2>).
9.
Enable PWM outputs after a new PWM cycle
has started:
Wait until TMR2 overflows (TMR2IF bit is set).
Enable the CCP1/P1A, P1B, P1C and/or P1D
pin outputs by clearing the respective TRISC
and TRISD bits.
Clear the ECCPASE bit (ECCPAS<7>).
16.4.8
OPERATION IN POWER-MANAGED
MODES
In Sleep mode, all clock sources are disabled. Timer2
will not increment and the state of the module will not
change. If the ECCP pin is driving a value, it will con-
tinue to drive that value. When the device wakes up, it
will continue from this state. If Two-Speed Start-ups are
enabled, the initial start-up frequency from INTOSC
and the postscaler may not be stable immediately.
In PRI_IDLE mode, the primary clock will continue to
clock the ECCP module without change.
In all other power-managed modes, the selected
power-managed mode clock will clock Timer2. Other
power-managed mode clocks will most likely be
different than the primary clock frequency.
16.4.8.1
OPERATION WITH FAIL-SAFE
CLOCK MONITOR
If
the
Fail-Safe
Clock
Monitor
is
enabled
(CONFIG1H<6> is programmed), a clock failure will
force the device into the power-managed RC_RUN
mode and the OSCFIF bit (PIR2<7>) will be set. The
ECCP will then be clocked from the internal oscillator
clock source which may have a different clock
frequency than the primary clock. By loading the
IRCF2:IRCF0 bits on Resets, the user can obtain a
frequency higher than the default INTRC clock source
in the event of a clock failure.
See the previous section for additional details.
16.4.9
EFFECTS OF A RESET
Both Power-on and subsequent Resets will force all
ports to Input mode and the CCP registers to their
Reset states.
This forces the Enhanced CCP module to reset to a
state compatible with the standard CCP module.
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