参数资料
型号: PIC12LC672T-04I/SM
厂商: Microchip Technology
文件页数: 70/129页
文件大小: 0K
描述: IC MCU OTP 2KX14 LV A/D 8-SOIJ
标准包装: 2,100
系列: PIC® 12C
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
外围设备: POR,WDT
输入/输出数: 5
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2.5 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.209",5.30mm 宽)
包装: 带卷 (TR)
其它名称: PIC12LC672T-04ISM
1999 Microchip Technology Inc.
DS30561B-page 45
PIC12C67X
REGISTER 8-1:
ADCON0 REGISTER (ADDRESS 1Fh)
R/W-0
ADCS1 ADCS0 reserved
CHS1
CHS0
GO/DONE reserved
ADON
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
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
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 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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