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| 型號(hào)： | PIC12C67X |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory |
| 中文描述： | 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲(chǔ)器 |
| 文件頁(yè)數(shù)： | 45/129頁(yè) |
| 文件大?。?/td> | 931K |
| 代理商： | PIC12C67X |
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1999 Microchip Technology Inc.
DS30561B-page 45
PIC12C67X
REGISTER 8-1:
ADCON0 REGISTER (ADDRESS 1Fh)
R/W-0
ADCS1 ADCS0
bit7
R/W-0
R/W-0
reserved
R/W-0
CHS1
R/W-0
CHS0
R/W-0
GO/DONE reserved
R/W-0
R/W-0
ADON
R =Readable bit
W = Writable bit
U =Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit0
bit 7-6:
ADCS<1:0>:
A/D Conversion Clock Select bits
00
= F
OSC
/2
01
= F
OSC
/8
10
= F
OSC
/32
11
= F
RC
(clock derived from an RC oscillation)
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
bit 5:
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 (V
DD
)
or the voltage level on the GP1/AN1/V
REF
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 dig-
ital I/O.
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.
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