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型号： PIC16LC62B-04/SS
厂商： Microchip Technology
文件页数： 51/120页
文件大小： 0K
描述： IC MCU OTP 2KX14 PWM 28SSOP
产品培训模块： Asynchronous Stimulus
标准包装： 47
系列： PIC® 16C
核心处理器： PIC
芯体尺寸： 8-位
速度： 4MHz
连通性： I²C，SPI
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 22
程序存储器容量： 3.5KB（2K x 14）
程序存储器类型： OTP
RAM 容量： 128 x 8
电压 - 电源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
振荡器型： 外部
工作温度： 0°C ~ 70°C
封装/外壳： 28-SSOP（0.209"，5.30mm 宽）
包装： 管件
PIC16C62B/72A
DS35008B-page 36
Preliminary
1999 Microchip Technology Inc.
7.3
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 PORTC data latch,
the TRISC<2> bit must be cleared to make the CCP1
pin an output.
Figure 7-3 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 7.3.3.
FIGURE 7-3:
SIMPLIFIED PWM BLOCK
DIAGRAM
A PWM output (Figure 7-4) has a time base (period)
and a time that the output stays high (on-time). The fre-
quency of the PWM is the inverse of the period
(1/period).
FIGURE 7-4:
PWM OUTPUT
7.3.1
PWM PERIOD
The PWM period is specified by writing to the PR2 reg-
ister. The PWM period can be calculated using the fol-
lowing formula:
PWM period = [(PR2) + 1] 4 TOSC
(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
7.3.2
PWM ON-TIME
The PWM on-time is specified by writing to the
CCPR1L register and to the CCP1CON<5:4> bits. Up
to 10-bit resolution is available. CCPR1L contains eight
MSbs and CCP1CON<5:4> contains 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:
PWM on-time = (CCPR1L:CCP1CON<5:4>)
Tosc (TMR2 prescale value)
CCPR1L and CCP1CON<5:4> can be written to at any
time, but the on-time 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 on-time. This double
buffering is essential for glitchless PWM operation.
When the CCPR1H and 2-bit latch match TMR2 con-
catenated with an internal 2-bit Q clock or 2 bits of the
TMR2 prescaler, the CCP1 pin is cleared.
Maximum PWM resolution (bits) for a given PWM
frequency:
For an example PWM period and on-time calculation,
see the PICmicro Mid-Range Reference Manual,
(DS33023).
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
(Note 1)
R
Q
S
Duty Cycle Registers
CCP1CON<5:4>
Clear Timer,
CCP1 pin and
latch D.C.
TRISC<2>
RC2/CCP1
Note 1: 8-bit timer is concatenated with 2-bit internal Q clock
or 2 bits of the prescaler to create 10-bit time-base.
Period
On-Time
TMR2 = PR2
TMR2 = Duty Cycle
TMR2 = PR2
Note:
The Timer2 postscaler (see Section 6.0) is
not used in the determination of the PWM
frequency. The postscaler could be used to
have a servo update rate at a different fre-
quency than the PWM output.
Note:
If the PWM on-time value is larger than the
PWM period, the CCP1 pin will not be
cleared.
log (
Fpwm
log(2)
Fosc
)
bits
=
Resolution
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PIC16LC62BT-04/SS 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16LC62BT-04I/ML 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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PIC16LC62BT-04I/SS 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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