参数资料
| 型号： | KSZ8864RMNI |
| 厂商： | Micrel Inc |
| 文件页数： | 89/111页 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET SWITCH 4PORT 64QFN |
| 特色产品： | KSZ8864RMN Ethernet Switches |
| 标准包装： | 348 |
| 系列： | * |
| 其它名称： | 576-3995 |
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1997 Microchip Technology Inc.
DS30444E - page 79
PIC16C9XX
FIGURE 12-1: ADCON0 REGISTER (ADDRESS 1Fh)
R/W-0
ADCS1 ADCS0
CHS2
CHS1
CHS0
GO/DONE
—
ADON
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit7
bit0
bit 7-6:
ADCS1:ADCS0: A/D Conversion Clock Select bits
00
= FOSC/2
01
= FOSC/8
10
= FOSC/32
11
= FRC (clock derived from an RC oscillation)
bit 5-3: 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)
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: Always maintain this bit clear
bit 0:
ADON: A/D On bit
1 = A/D converter module is operating
0 = A/D converter module is shutoff and consumes no operating current
12.0
ANALOG-TO-DIGITAL
CONVERTER (A/D) MODULE
This section applies to the PIC16C924 only.
The analog-to-digital (A/D) converter module has ve
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 AVDD pin or the voltage level
on the RA3/AN3/VREF pin. The A/D converter has a
unique feature of being able to operate while the device
is in SLEEP mode.
To operate 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 Figure 12-1, controls
the operation of the A/D module. The ADCON1 regis-
ter, shown in Figure 12-2, congures the functions of
the port pins. The port pins can be congured as ana-
log inputs (RA3 can also be a voltage reference) or as
digital I/O.
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