參數(shù)資料
型號(hào): PIC18F14K50-I/P
廠商: Microchip Technology
文件頁(yè)數(shù): 94/285頁(yè)
文件大小: 0K
描述: IC PIC MCU FLASH 8KX16 20-PDIP
產(chǎn)品培訓(xùn)模塊: XLP Deep Sleep Mode
8-bit PIC® Microcontroller Portfolio
視頻文件: World's Lowest Power in Sleep MCU: nanoWatt XLP
標(biāo)準(zhǔn)包裝: 22
系列: PIC® XLP™ 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 48MHz
連通性: I²C,SPI,UART/USART,USB
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 14
程序存儲(chǔ)器容量: 16KB(8K x 16)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 11x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-DIP(0.300",7.62mm)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 656 (CN2011-ZH PDF)
配用: AC244023-ND - PROC EXTENS PAK PIC18F1XK50
DV164126-ND - KIT DEVELOPMENT USB W/PICKIT 2
DM164127-ND - KIT DEVELOPMENT USB 18F14/13K50
AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP
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dsPIC30F1010/202X
DS70178C-page 182
Preliminary
2006 Microchip Technology Inc.
16.6
Reverse Conversion Order
The ORDER control bit in the ADCON register, when
set, reverses the order of the input pair conversion pro-
cess. Normally (ORDER = 0), the even numbered
input of an input pair is converted first and then the odd
numbered input is converted. If ORDER = 1, the odd
numbered input pin of an input pair is converted first,
followed by the even numbered pin.
This feature is useful when using voltage control
modes and using the early interrupt capability
(EIE = 1). These features enable the user to minimize
the time period from actual acquisition of the feedback
(ADC) data to the update of the control output (PWM).
This time from input to output of the control system
determines the overall stability of the control system.
16.7
Simultaneous and Sequential
Sampling in a pair
The inputs that have dedicated Sample and Hold
(S&H) circuits are sampled when their specified trigger
events occur. The inputs that share the common sam-
ple and hold circuit are sampled in the following
manner:
1.
If the SEQSAMP bit = 0, and the common
(shared) sample and hold circuit is NOT busy,
then the shared S&H will sample their specified
input at the same time as the dedicated S&H.
This action provides “Simultaneous” sample and
hold functionality.
2.
If the SEQSAMP bit = 0, and the shared S&H is
currently busy with a conversion in progress,
then the shared S&H will sample as soon as
possible (at the start of the new conversion
process for the pair).
3.
If the SEQSAMP bit = 1, then the shared S&H
will sample at the start of the conversion process
for that input. For example: If the ORDER bit = 0
the shared S&H will sample at the start of the
conversion of the second input. If ORDER = 1,
then the shared S&H will sample at the start of
the conversion for the first input.
The SEQSAMP bit is useful for some applica-
tions that want to minimize the time from a
sample event to the conversion of the sample.
When SEQSAMP = 0, the logic attempts to take
the samples for both inputs of a pair at the same
time if the resources are available. The user can
often ensure that the ADC will not be busy with
a prior conversion by controlling the timing of the
trigger signals that initiate the conversion
processes.
16.8
Group Interrupt Generation
The ADC module provides a common or “Group” inter-
rupt request that is the OR of all of the enabled interrupt
sources within the module. Each CPC register has two
IRQENx bits, one for each analog input pair. If the
IRQEN bit is set, an interrupt request is made to the
interrupt controller when the requested conversion is
completed. When an interrupt is generated, an asso-
ciated PxRDY bit in the ADSTAT register is set. The
PxRDY bit is cleared by the user. The user’s software
can examine the ADSTAT register’s PxRDY bits to
determine if additional requested conversions have
been completed.
The group interrupt is useful for applications that use a
common software routine to process ADC interrupts for
multiple analog input pairs. This method is more
traditional in concept.
Note:
The user must clear the IFS bit associated
with the ADC in the interrupt controller
before the PxRDY bit is cleared. Failure to
do so may cause interrupts to be lost. The
reason is that the ADC will possibly have
another interrupt pending. If the user
clears the PxRDY bit first, the ADC may
generate another interrupt request, but if
the user then clears the IFS bit, the
interrupt request will be erased.
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