參數(shù)資料
型號： PIC16CR77
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 85/172頁
文件大?。?/td> 1506K
代理商： PIC16CR77
2007 Microchip Technology Inc.
DS21993C-page 83
PIC16CR7X
11.0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
The 8-bit Analog-to-Digital (A/D) converter module has
five inputs for the PIC16CR73/76 and eight for the
PIC16CR74/77.
The A/D allows conversion of an analog input signal to
a corresponding 8-bit digital number. The output of the
sample and hold is the input into the converter, which
generates the result via successive approximation. The
analog reference voltage is software selectable to
either the device’s positive supply voltage (V
DD
), or the
voltage level on the RA3/AN3/V
REF
pin.
The A/D converter has a unique feature of being able
to operate while the device is in Sleep mode. To oper-
ate in Sleep, the A/D conversion clock must be derived
from the A/D’s internal RC oscillator.
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 Register 11-1,
controls the operation of the A/D module. The
ADCON1 register, shown in Register 11-2, 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 digital I/O.
Additional information on using the A/D module can be
found in the “
PIC
Mid-Range MCU Family Reference
Manual
” (DS33023) and in Application Note AN546,
“
Using The Analog-to-Digital Converter
” (DS00546).
REGISTER 11-1:
ADCON0: (ADDRESS 1Fh)
R/W-0
ADCS1
bit 7
R/W-0
ADCS0
R/W-0
CHS2
R/W-0
CHS1
R/W-0
CHS0
R/W-0
GO/DONE
U-0
—
R/W-0
ADON
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
ADCS1:ADCS0:
A/D Conversion Clock Select bits
00
= F
OSC
/2
01
= F
OSC
/8
10
= F
OSC
/32
11
= F
RC
(clock derived from the internal A/D module RC oscillator)
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)
101
= Channel 5 (RE0/AN5)
(1)
110
= Channel 6 (RE1/AN6)
(1)
111
= Channel 7 (RE2/AN7)
(1)
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)
Unimplemented
: Read as ‘
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
Note:
A/D channels 5, 6 and 7 are implemented on the PIC16CR74/77 only.
bit 5-3
bit 2
bit 1
bit 0
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