參數(shù)資料
型號(hào): PIC16C73B
廠商: Microchip Technology Inc.
英文描述: 8-Bit CMOS Microcontrollers with A/D Converter(帶A/D轉(zhuǎn)換器的8位CMOS微控制器)
中文描述: 8位CMOS微控制器與A / D轉(zhuǎn)換器(帶的A / D轉(zhuǎn)換器的8位的CMOS微控制器)
文件頁(yè)數(shù): 53/184頁(yè)
文件大小: 2230K
代理商: PIC16C73B
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2000 Microchip Technology Inc.
DS30605C-page 53
PIC16C63A/65B/73B/74B
A PWM output (Figure 9-4) 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 9-4:
PWM OUTPUT
9.3.1
PWM PERIOD
The PWM period is specified by writing to the PR2
register. The PWM period can be calculated using the
following formula:
PWM 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
9.3.2
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:
PWM duty cycle =
(CCPR1L:CCP1CON<5:4>)
T
OSC
(TMR2 prescale value)
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, 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:
9.3.3
SET-UP FOR PWM OPERATION
The following steps should be taken when configuring
the CCP module for PWM operation:
1.
Set the PWM period by writing to the PR2 register.
2.
Set the PWM duty cycle by writing to the
CCPR1L register and CCP1CON<5:4> bits.
3.
Make the CCP1 pin an output by clearing the
TRISC<2> bit.
4.
Set the TMR2 prescale value and enable Timer2
by writing to T2CON.
5.
Configure the CCP1 module for PWM operation.
TABLE 9-3:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz
Note:
The Timer2 postscaler (see Section 8.1) 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.
Period
Duty Cycle
TMR2 = PR2
TMR2 = Duty Cycle
TMR2 = PR2 (Timer2 RESET)
(Timer2 RESET)
Note:
If the PWM duty cycle value is longer than
the PWM period, the CCP1 pin will not be
cleared.
log
(
F
PWM
log(2)
F
OSC
)
bits
=
Resolution
PWM Frequency
Timer Prescaler (1, 4, 16)
PR2 Value
Maximum Resolution (bits)
1.22 kHz
16
0xFF
10
4.88 kHz
4
0xFF
10
19.53 kHz
1
0xFF
10
78.12 kHz
1
0x3F
8
156.3 kHz
1
0x1F
7
208.3 kHz
1
0x17
5.5
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PIC16C73B/JW 功能描述:8位微控制器 -MCU 7KB 192 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C73B-04/SO 功能描述:8位微控制器 -MCU 7KB 192 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C73B-04/SO 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C73 SOIC28
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PIC16C73B-04/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C73 SDIL28