參數(shù)資料
型號： PIC16F818
廠商： Microchip Technology Inc.
英文描述： 18/20-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology(18/20引腳，納瓦技術(shù)增強(qiáng)FLASH微控制器)
中文描述： 18/20-Pin增強(qiáng)型閃存微控制器采用納瓦技術(shù)（18/20引腳，納瓦技術(shù)增強(qiáng)閃存微控制器）
文件頁數(shù)： 87/164頁
文件大?。?/td> 3045K
代理商： PIC16F818
2002 Microchip Technology Inc.
Preliminary
DS39598C-page 85
PIC16F818/819
11.2
Selecting the A/D Conversion
Clock
The A/D conversion time per bit is defined as T
AD
. The
A/D conversion requires 9.0 T
AD
per 8-bit conversion.
The source of the A/D conversion clock is software
selectable. The seven possible options for T
AD
are:
2 T
OSC
4 T
OSC
8 T
OSC
16 T
OSC
32 T
OSC
64 T
OSC
Internal A/D module RC oscillator (2 - 6
μ
s)
For correct A/D conversions, the A/D conversion clock
(T
AD
) must be selected to ensure a minimum T
AD
time
as small as possible, but no less than 1.6
μ
s and not
greater than 6.4
μ
s.
Table 11-1 shows the resultant T
AD
times derived from
the device operating frequencies and the A/D clock
source selected.
11.3
Configuring Analog Port Pins
The ADCON1, and TRISA registers control the opera-
tion of the A/D port pins. The port pins that are desired
as analog inputs must have their corresponding TRIS
bits set (input). If the TRIS bit is cleared (output), the
digital output level (V
OH
or V
OL
) will be converted.
The A/D operation is independent of the state of the
CHS<2:0> bits and the TRIS bits.
TABLE 11-1:
T
AD
vs. MAXIMUM DEVICE OPERATING FREQUENCIES (STANDARD DEVICES (C))
Note 1:
When reading the port register, all pins
configured as analog input channels will
read as cleared (a low level). Pins config-
ured as digital inputs, will convert an ana-
log input. Analog levels on a digitally
configured input will not affect the
conversion accuracy.
2:
Analog levels on any pin that is defined as
a digital input (including the AN4:AN0
pins), may cause the input buffer to
consume current out of the device
specification.
AD Clock Source (T
AD
)
Maximum Device Frequency
Operation
ADCS<2>
ADCS<1:0>
Max.
2 T
OSC
4 T
OSC
8 T
OSC
16 T
OSC
32 T
OSC
64 T
OSC
RC
(1,2,3)
0
1
0
1
0
1
X
00
00
01
01
10
10
11
1.25 MHz
2.5 MHz
5 MHz
10 MHz
20 MHz
20 MHz
(Note 1)
Note 1:
The RC source has a typical T
AD
time of 4
μ
s but can vary between 2 - 6
μ
s.
2:
When the device frequencies are greater than 1 MHz, the RC A/D conversion clock source is only
recommended for SLEEP operation.
3:
For extended voltage devices (LF), please refer to the Electrical Characteristics (Section 15.0 and
Section 15.4).
相關(guān)PDF資料
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參數(shù)描述
PIC16F818-E/ML 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp QFN28 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F818-E/P 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp PDIP18 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F818-E/SO 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp SOIC18 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F818-E/SS 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp SSOP20 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 最大時鐘頻率:50 MHz 程序存儲器大小: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
PIC16F818-E/SS 制造商:Microchip Technology Inc 功能描述:IC 8BIT MCU PIC16F 20MHz SSOP-20 制造商:Microchip Technology Inc 功能描述:IC, 8BIT MCU, PIC16F, 20MHz, SSOP-20
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