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参数资料
型号： ATMEGA329V-8MUR
厂商： Atmel
文件页数： 81/146页
文件大小： 0K
描述： MCU AVR 32K FLASH 8MHZ 64QFN
产品培训模块： megaAVR Introduction
标准包装： 4,000
系列： AVR® ATmega
核心处理器： AVR
芯体尺寸： 8-位
速度： 8MHz
连通性： SPI，UART/USART，USI
外围设备： 欠压检测/复位，LCD，POR，PWM，WDT
输入/输出数： 54
程序存储器容量： 32KB（16K x 16）
程序存储器类型： 闪存
EEPROM 大小： 1K x 8
RAM 容量： 2K x 8
电压 - 电源 (Vcc/Vdd)： 1.8 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 64-VFQFN 裸露焊盘
包装： 带卷 (TR)
其它名称： ATMEGA329V-8MUR-ND
ATMEGA329V-8MURTR
2010-2012 Microchip Technology Inc.
DS41440C-page 323
PIC16(L)F1825/1829
27.1
Analog MUX
The CPS module can monitor up to four inputs for the
PIC16(L)F1825 (CPSCH<7:0>) and up to eight inputs
for
the
PIC16(L)F1829
(CPSCH<11:0>).
See
Register 27-2 for details. The capacitive sensing inputs
are defined as CPS<11:0>, as applicable to device. To
determine if a frequency change has occurred the user
must:
Select the appropriate CPS pin by setting the
CPSCH<3:0> bits of the CPSCON1 register.
Set the corresponding ANSEL bit.
Set the corresponding TRIS bit.
Run the software algorithm.
The CPS module can monitor up to four inputs for the
PIC16(L)F1825 (CPSCH<7:0>) and up to eight inputs
for
the
PIC16(L)F1829
(CPSCH<11:0>).
See
Register 27-2 for details. The capacitive sensing inputs
are defined as CPS<11:0>, as applicable to device. To
determine if a frequency change has occurred the user
must:
Select the appropriate CPS pin by setting the
appropriate CPSCH bits of the CPSCON1 register.
Set the corresponding ANSEL bit.
Set the corresponding TRIS bit.
Run the software algorithm.
Selection of the CPSx pin while the module is enabled
will cause the capacitive sensing oscillator to be on the
CPSx pin. Failure to set the corresponding ANSEL and
TRIS bits can cause the capacitive sensing oscillator to
stop, leading to false frequency readings.
27.2
Capacitive Sensing Oscillator
The capacitive sensing oscillator consists of a constant
current source and a constant current sink, to produce
a triangle waveform. The CPSOUT bit of the
CPSCON0 register shows the status of the capacitive
sensing oscillator, whether it is a sinking or sourcing
current. The oscillator is designed to drive a capacitive
load (single PCB pad) and at the same time, be a clock
source to either Timer0 or Timer1. The oscillator has
three different current settings as defined by
CPSRNG<1:0> of the CPSCON0 register. The different
current settings for the oscillator serve two purposes:
Maximize the number of counts in a timer for a
fixed time base.
Maximize the count differential in the timer during
a change in frequency.
27.3
Voltage References
The capacitive sensing oscillator uses voltage
references to provide two voltage thresholds for
oscillation. The upper voltage threshold is referred to
as Ref+ and the lower voltage threshold is referred to
as Ref-.
The user can elect to use Fixed Voltage References,
which are internal to the capacitive sensing oscillator,
or variable voltage references, which are supplied by
the Fixed Voltage Reference (FVR) module and the
Digital-to-Analog Converter (DAC) module.
When the Fixed Voltage References are used, the VSS
voltage determines the lower threshold level (Ref-) and
the VDD voltage determines the upper threshold level
(Ref+).
When the variable voltage references are used, the
DAC voltage determines the lower threshold level
(Ref-) and the FVR voltage determines the upper
threshold level (Ref+). An advantage of using these
reference sources is that oscillation frequency remains
constant with changes in VDD.
Different oscillation frequencies can be obtained
through the use of these variable voltage references.
The more the upper voltage reference level is lowered
and the more the lower voltage reference level is
raised, the higher the capacitive sensing oscillator
frequency becomes.
Selection between the voltage references is controlled
by the CPSRM bit of the CPSCON0 register. Setting
this bit selects the variable voltage references and
clearing this bit selects the Fixed Voltage References.
Please see Section 14.0 “Fixed Voltage Reference
(FVR)” and Section 17.0 “Digital-to-Analog Converter
(DAC) Module” for more information on configuring the
variable voltage levels.
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