参数资料
型号: PIC16LC716-04/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件页数: 54/106页
文件大小: 1718K
代理商: PIC16LC716-04/SS
2005 Microchip Technology Inc.
DS41106B-page 49
PIC16C712/716
8.2
Selecting the A/D Conversion
Clock
The A/D conversion time per bit is defined as TAD. The
A/D conversion requires 9.5TAD per 8-bit conversion.
The source of the A/D conversion clock is software
selectable. The four possible options for TAD are:
2TOSC
8TOSC
32TOSC
Internal RC oscillator
For correct A/D conversions, the A/D conversion clock
(TAD) must be selected to ensure a minimum TAD time
of 1.6
μs.
Table 8-1 shows the resultant TAD times derived from
the device operating frequencies and the A/D clock
source selected.
8.3
Configuring Analog Port Pins
The ADCON1 and TRISA registers control the opera-
tion of the A/D port pins. The port pins that are desired
as analog inputs must have their corresponding TRIS
bits set (input). If the TRIS bit is cleared (output), the
digital output level (VOH or VOL) will be converted.
The A/D operation is independent of the state of the
CHS2:CHS0 bits and the TRIS bits.
TABLE 8-1:
TAD vs. DEVICE OPERATING FREQUENCIES
Note 1: When reading the port register, all pins
configured as analog input channels will
read as cleared (a low level). Pins
configured as digital inputs, will convert
an analog input. Analog levels on a
digitally configured input will not affect the
conversion accuracy.
2: Analog levels on any pin that is defined as
a digital input (including the AN3:AN0
pins), may cause the input buffer to
consume current that is out of the devices
specification.
AD Clock Source (TAD)
Device Frequency
Operation
ADCS1:ADCS0
20 MHz
5 MHz
1.25 MHz
333.33 kHz
2TOSC
00
100 ns(2)
400 ns(2)
1.6
μs6 μs
8TOSC
01
400 ns(2)
1.6
μs6.4 μs
24
μs(3)
32TOSC
10
1.6
μs6.4 μs
25.6
μs(3)
96
μs(3)
RC(5)
11
2-6
μs(1,4)
2-6
μs(1,4)
2-6
μs(1,4)
2-6
μs(1)
Legend: Shaded cells are outside of recommended range.
Note 1: The RC source has a typical TAD time of 4
μs.
2: These values violate the minimum required TAD time.
3: For faster conversion times, the selection of another clock source is recommended.
4: When device frequency is greater than 1 MHz, the RC A/D conversion clock source is recommended for
Sleep operation only.
5: For extended voltage devices (LC), please refer to Electrical Specifications section.
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