參數(shù)資料
型號: PIC16C62B-20I/ML
廠商: Microchip Technology
文件頁數(shù): 65/120頁
文件大?。?/td> 0K
描述: IC MCU OTP 2KX14 PWM 28QFN
標(biāo)準(zhǔn)包裝: 61
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-VQFN 裸露焊盤
包裝: 管件
其它名稱: PIC16C62B20I/ML
PIC16C62B/72A
1999 Microchip Technology Inc.
Preliminary
DS35008B-page 49
9.0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
The analog-to-digital (A/D) converter module has five
input channels.
The A/D allows conversion of an analog input signal to
a corresponding 8-bit digital number (refer to Applica-
tion Note AN546 for use of A/D Converter). The output
of the sample and hold is the input into the converter,
which generates the result via successive approxima-
tion. The analog reference voltage is software select-
able to either the device’s positive supply voltage (VDD)
or the voltage level on the RA3/AN3/VREF pin.
The A/D converter has the feature of being able to
operate while the device is in SLEEP mode. To operate
in sleep, the A/D conversion clock must be derived from
the A/D’s internal RC oscillator.
Additional information on the A/D module is available in
the
PICmicro
Mid-Range
Reference
Manual,
(DS33023).
The A/D module has three registers. These registers
are:
A/D Result Register (ADRES)
A/D Control Register 0 (ADCON0)
A/D Control Register 1 (ADCON1)
A device reset forces all registers to their reset state.
This forces the A/D module to be turned off, and any
conversion is aborted.
The ADCON0 register, shown in Figure 9-1, controls
the operation of the A/D module. The ADCON1 regis-
ter, shown in Figure 9-2, configures the functions of the
port pins. The port pins can be configured as analog
inputs (RA3 can also be a voltage reference) or as dig-
ital I/O.
REGISTER 9-1:ADCON0 REGISTER (ADDRESS 1Fh)
Note:
This section applies to the PIC16C72A
only.
R/W-0
U-0
R/W-0
ADCS1 ADCS0
CHS2
CHS1
CHS0
GO/DONE
ADON
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7
bit0
bit 7-6:
ADCS1:ADCS0: A/D Conversion Clock Select bits
00
= FOSC/2
01
= FOSC/8
10
= FOSC/32
11
= FRC (clock derived from an internal RC oscillator)
bit 5-3: CHS2:CHS0: Analog Channel Select bits
000
= channel 0, (RA0/AN0)
001
= channel 1, (RA1/AN1)
010
= channel 2, (RA2/AN2)
011
= channel 3, (RA3/AN3)
100
= channel 4, (RA5/AN4)
bit 2:
GO/DONE: A/D Conversion Status bit
If ADON = 1
1
= A/D conversion in progress (setting this bit starts the A/D conversion)
0
= A/D conversion not in progress (This bit is automatically cleared by hardware when the A/D
conversion is complete)
bit 1:
Unimplemented: Read as '0'
bit 0:
ADON: A/D On bit
1
= A/D converter module is operating
0
= A/D converter module is shutoff and consumes no operating current
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