參數(shù)資料
型號: PIC16LC433E/P
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18
封裝: 0.300 INCH, PLASTIC, DIP-18
文件頁數(shù): 61/122頁
文件大?。?/td> 1862K
代理商: PIC16LC433E/P
2001 Microchip Technology Inc.
Advance Information
DS41139A-page 41
PIC16C433
8.0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
The Analog-to-Digital (A/D) converter module has four
analog inputs.
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 GP1/AN1/VREF pin.
The A/D converter has a unique feature of being able
to operate while the device is in SLEEP mode.
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)
The ADCON0 Register, shown in Figure 8-1, controls
the operation of the A/D module. The ADCON1 Regis-
ter, shown in Figure 8-2, configures the functions of the
port pins. The port pins can be configured as analog
inputs (GP1 can also be a voltage reference) or as
digital I/O.
REGISTER 8-1:
ADCON0 REGISTER (ADDRESS 1Fh)
Note 1: If the port pins are configured as analog
inputs (RESET condition), reading the
port (MOVF
GPIO,W
) results in reading
'0's.
2: Changing ADCON1 Register can cause
the GPIF and INTF flags to be set in the
INTCON Register.
These interrupts
should be disabled prior to modifying
ADCON1.
R/W-0
ADCS1
ADCS0
reserved
CHS1
CHS0
GO/DONE
reserved
ADON
bit7
bit0
bit 7-6
ADCS<1:0>: A/D Conversion Clock Select bits
00
= FOSC/2
01
= FOSC/8
10
= FOSC/32
11
= FRC (clock derived from an RC oscillation)
bit 5
Reserved
bit 4-3
CHS<1:0>: Analog Channel Select bits
00
= channel 0, (GP0/AN0)
01
= channel 1, (GP1/AN1)
10
= channel 2, (GP2/AN2)
11
= channel 3, (GP4/AN3)
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
Reserved
bit 0
ADON: A/D On bit
1
= A/D converter module is operating
0
= A/D converter module is shut-off and consumes no operating current
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR reset
’1’ = Bit is set
’0’ = Bit is cleared
x = Bit is unknown
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