PIC16F874A-E/L Microchip Technology, PIC16F874A-E/L Datasheet - Page 434
PIC16F874A-E/L
Manufacturer Part Number
PIC16F874A-E/L
Description
IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,LDCC,44PIN,PLASTIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16C770-ISO.pdf
(8 pages)
4.PIC16F873A-ISO.pdf
(234 pages)
5.PIC16F873A-ISO.pdf
(6 pages)
6.PIC16F873A-ISO.pdf
(4 pages)
7.PIC16F873A-ISO.pdf
(6 pages)
8.PIC16F873A-ISO.pdf
(4 pages)
9.PIC16F873A-ISO.pdf
(22 pages)
Specifications of PIC16F874A-E/L
Rohs Compliant
YES
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
DVA16XL441 - ADAPTER DEVICE ICE 44PLCC309-1040 - ADAPTER 44-PLCC ZIF TO 40-DIP309-1039 - ADAPTER 44-PLCC TO 40-DIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F874A-E/L
Manufacturer:
Microchip Technology
Quantity:
10 000
- PIC16F616T-ISL PDF datasheet
- PIC16F688T-ISL PDF datasheet #2
- PIC16C770-ISO PDF datasheet #3
- PIC16F873A-ISO PDF datasheet #4
- PIC16F873A-ISO PDF datasheet #5
- PIC16F873A-ISO PDF datasheet #6
- PIC16F873A-ISO PDF datasheet #7
- PIC16F873A-ISO PDF datasheet #8
- PIC16F873A-ISO PDF datasheet #9
- Current page: 434 of 688
- Download datasheet (3Mb)
PICmicro MID-RANGE MCU FAMILY
23.7.1
DS31023A-page 23-12
Faster Conversion - Lower Resolution Trade-off
Not all applications require a result with 10-bits of resolution, but may instead require a faster
conversion time. The A/D module allows users to make the trade-off of conversion speed to res-
olution. Regardless of the resolution required, the acquisition time is the same. To speed up the
conversion, the clock source of the A/D module may be switched so that the T
the minimum specified time (see the applicable electrical specification). Once the T
lates the minimum specified time, all the following A/D result bits are not valid (see A/D Conver-
sion Timing in the Electrical Specifications section). The clock sources may only be switched
between the three oscillator versions (cannot be switched from/to RC). The equation to deter-
mine the time before the oscillator can be switched is as follows:
Since the T
ware loop, etc.) to determine when the A/D oscillator may be changed.
comparison of time required for a conversion with 4-bits of resolution, versus the 10-bit resolution
conversion. The example is for devices operating at 20 MHz (The A/D clock is programmed for
32T
The 2T
values.
Example 23-4:
Note 1: A minimum T
T
T
2T
AD
OSC
Conversion time
Where: N
OSC
AD
2: If the full 8-bit conversion is required, the A/D clock source should not be changed.
OSC
+ N • T
), and assumes that immediately after 6T
AD
violates the minimum T
AD
is based from the device oscillator, the user must use some method (a timer, soft-
+ (11 - N)(2T
4-bit vs. 8-bit Conversion Times
= T
= number of bits of resolution required.
AD
time of 1.6 s is required.
AD
Preliminary
+ N • T
OSC
)
AD
AD
time since the last 4 bits will not be converted to correct
+ (11 - N)(2T
(MHz)
Freq.
20
20
20
AD
, the A/D clock is programmed for 2T
(1)
OSC
)
1.6 s
8.7 s
50 ns
4-bit
1997 Microchip Technology Inc.
Resolution
Example 23-4
AD
17.6 s
time violates
10-bit
1.6 s
50 ns
AD
time vio-
shows a
OSC
.
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