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PIC16C925-S/CL датащи(PDF) 81 Page - Microchip Technology

номер детали PIC16C925-S/CL
подробное описание детали  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C925-S/CL датащи(HTML) 81 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Preliminary
DS39544A-page 79
PIC16C925/926
10.2
Selecting the A/D Conversion
Clock
The A/D conversion time per bit is defined as TAD. The
A/D conversion requires a minimum 12TAD per 10-bit
conversion. The source of the A/D conversion clock is
software selected. The four possible options for TAD
are:
• 2TOSC
• 8TOSC
• 32TOSC
• Internal A/D module 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 10-1 shows the resultant TAD times derived from
the device operating frequencies and the A/D clock
source selected.
TABLE 10-1:
TAD vs. MAXIMUM DEVICE OPERATING FREQUENCIES (STANDARD DEVICES (C))
AD Clock Source (TAD)
Maximum Device Frequency
Operation
ADCS<1:0>
Max.
2TOSC
00
1.25 MHz
8TOSC
01
5 MHz
32TOSC
10
20 MHz
RC(1, 2, 3)
11
(Note 1)
Note 1: The RC source has a typical TAD time of 4
µs, but can vary between 2-6 µs.
2: When the device frequencies are greater than 1 MHz, the RC A/D conversion clock source is only recom-
mended for SLEEP operation.
3: For extended voltage devices (LC), please refer to the Electrical Specifications section.



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