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參數(shù)資料
| 型號： | ENC424J600T-I/ML |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 124/168頁 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET CTRLR W/SPI 44-QFN |
| 視頻文件： | Fast 100 Mbps Ethernet PICtail Plus Overview |
| 標(biāo)準(zhǔn)包裝： | 1,600 |
| 控制器類型： | 以太網(wǎng)控制器（IEEE 802.3） |
| 接口： | SPI |
| 電源電壓： | 3 V ~ 3.6 V |
| 電流 - 電源： | 96mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-VQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 44-QFN（8x8） |
| 包裝： | 帶卷 (TR) |
| 配用： | AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET |
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2007 Microchip Technology Inc.
DS21993C-page 57
PIC16CR7X
8.5
PWM Mode (PWM)
In Pulse Width Modulation mode, the CCPx pin
produces up to a 10-bit resolution PWM output. Since
the CCP1 pin is multiplexed with the PORTC data latch,
the TRISC<2> bit must be cleared to make the CCP1
pin an output.
Figure 8-3 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 8.5.3 “SetUp
FIGURE 8-3:
SIMPLIFIED PWM BLOCK
DIAGRAM
A PWM output (Figure 8-4) 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 8-4:
PWM OUTPUT
8.5.1
PWM PERIOD
The PWM period is specified by writing to the PR2
register. The PWM period can be calculated using the
following formula:
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
8.5.2
PWM DUTY CYCLE
The PWM duty cycle is specified by writing to the
CCPR1L register and to the CCP1CON<5:4> bits. Up
to 10-bit resolution is available. The CCPR1L contains
the eight MSbs and the CCP1CON<5:4> contains the
two LSbs. This 10-bit value is represented by
CCPR1L:CCP1CON<5:4>. The following equation is
used to calculate the PWM duty cycle in time:
CCPR1L and CCP1CON<5:4> can be written to at any
time, but the duty cycle value is not latched into
CCPR1H until after a match between PR2 and TMR2
occurs (i.e., the period is complete). In PWM mode,
CCPR1H is a read-only register.
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 operation.
When the CCPR1H and 2-bit latch match TMR2,
concatenated with an internal 2-bit Q clock or 2 bits of
the TMR2 prescaler, the CCP1 pin is cleared.
The maximum PWM resolution (bits) for a given PWM
frequency is given by the formula:
Note:
Clearing the CCP1CON register will force
the CCP1 PWM output latch to the default
low level. This is not the PORTC I/O data
latch.
CCPR1L
CCPR1H (Slave)
Comparator
TMR2
Comparator
PR2
(1)
RQ
S
Duty Cycle Registers
CCP1CON<5:4>
Clear Timer,
CCP1 pin and
latch D.C.
TRISC<2>
RC2/CCP1
(Note 1)
Note 1: The 8-bit timer is concatenated with the 2-bit inter-
nal Q clock or the 2 bits of the prescaler to create the
10-bit time base.
Period
Duty Cycle
TMR2 = PR2
TMR2 = Duty Cycle
TMR2 = PR2
TMR2
Reset
TMR2
Reset
Note:
The Timer2 postscaler (see Section 8.3
“Capture Mode”) is not used in the deter-
mination of the PWM frequency. The
postscaler could be used to have a servo
update rate at a different frequency than
the PWM output.
Note:
If the PWM duty cycle value is longer than
the PWM period, the CCP1 pin will not be
cleared.
PWM period = [(PR2) + 1] 4 TOSC
(TMR2 prescale value)
PWM duty cycle = (CCPR1L:CCP1CON<5:4>)
TOSC (TMR2 prescale value)
log
(
FPWM
log(2)
FOSC )
bits
=
Resolution
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