参数资料
型号: PIC18F452-I/PT
厂商: Microchip Technology
文件页数: 114/134页
文件大小: 0K
描述: IC MCU FLASH 16KX16 EE 44TQFP
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 160
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,LVD,POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 1.5K x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 托盘
配用: XLT44PT3-ND - SOCKET TRAN ICE 44MQFP/TQFP
AC164305-ND - MODULE SKT FOR PM3 44TQFP
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
AC164020-ND - MODULE SKT PROMATEII 44TQFP
PIC16C9XX
DS30444E - page 80
1997 Microchip Technology Inc.
FIGURE 12-2: ADCON1 REGISTER (ADDRESS 9Fh)
U-0
R/W-0
PCFG2
PCFG1
PCFG0
R = Readable bit
W = Writable bit
U = Unimplemented
bit, read as ‘0’
- n = Value at POR reset
bit7
bit0
bit 7-3:
Unimplemented: Read as '0'
bit 2-0:
PCFG2:PCFG0: A/D Port Conguration Control bits
A = Analog input
D = Digital I/O
PCFG2:PCFG0
RA0
RA1
RA2
RA5
RA3
VREF
000
A
AVDD
001
A
VREF
RA3
010
A
AVDD
011
A
VREF
RA3
100
A
D
A
AVDD
111
D
The ADRES register contains the result of the A/D con-
version. When the A/D conversion is complete, the
result is loaded into the ADRES register, the GO/DONE
bit (ADCON0<2>) is cleared, and A/D interrupt ag bit
ADIF is set. The block diagram of the A/D module is
shown in Figure 12-3.
After the A/D module has been congured as desired,
the selected channel must be acquired before the con-
version is started. The analog input channels must
have their corresponding TRIS bits selected as an
input. To determine acquisition time, see Section 12.1.
After this acquisition time has elapsed the A/D conver-
sion can be started. The following steps should be fol-
lowed for doing an A/D conversion:
1.
Congure the A/D module:
Congure analog pins / voltage reference /
and digital I/O (ADCON1)
Select A/D input channel (ADCON0)
Select A/D conversion clock (ADCON0)
Turn on A/D module (ADCON0)
2.
Congure A/D interrupt (if desired):
Clear ADIF bit
Set ADIE bit
Set GIE bit
3.
Wait the required acquisition time.
4.
Start conversion:
Set GO/DONE bit (ADCON0)
5.
Wait for A/D conversion to complete, by either:
Polling for the GO/DONE bit to be cleared
OR
Waiting for the A/D interrupt
6.
Read A/D Result register (ADRES), clear bit
ADIF if required.
7.
For next conversion, go to step 1 or step 2 as
required. The A/D conversion time per bit is
dened as TAD. A minimum wait of 2TAD is
required before next acquisition starts.
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