PIC18F4580-I/P Microchip Technology Inc., PIC18F4580-I/P Datasheet - Page 249

• Manufacturer Part Number: PIC18F4580-I/P
• Description: 40 PIN, 32 KB FLASH, 1536 RAM, 36 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4580-I/P

• A/d Inputs: 11-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: CAN/I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 32K Bytes
• Ram Size: 1.5K Bytes
• Speed: 40 MHz
• Timers: 1-8 bit, 3-16 bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

20.4
Figure 20-4 shows the operation of the A/D converter
after the GO bit has been set. Clearing the GO/DONE
bit during a conversion will abort the current conver-
sion. The A/D Result register pair will not be updated
with the partially completed A/D conversion sample.
That is, the ADRESH:ADRESL registers will continue
to contain the value of the last completed conversion
(or the last value written to the ADRESH:ADRESL
registers). After the A/D conversion is aborted, a 2 T
wait is required before the next acquisition is started.
After this 2 T
channel is automatically started.
FIGURE 20-3:
 2004 Microchip Technology Inc.
Note:
A/D Conversions
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
AD
7
0000 00
wait, acquisition on the selected
ADRESH
A/D RESULT JUSTIFICATION
Right Justified
2 1 0 7
ADFM = 1
10-bit Result
ADRESL
0
AD
10-bit Result
20.4.1
The ADRESH:ADRESL register pair is the location
where the 10-bit A/D result is loaded at the completion
of the A/D conversion. This register pair is 16 bits wide.
The A/D module gives the flexibility to left or right justify
the 10-bit result in the 16-bit result register. The A/D
Format Select bit (ADFM) controls this justification.
Figure 20-3 shows the operation of the A/D result justi-
fication. The extra bits are loaded with ‘0’s. When an
A/D result will not overwrite these locations (A/D
disable), these registers may be used as two general
purpose 8-bit registers.
7
ADRESH
10-bit Result
A/D RESULT REGISTERS
ADFM = 0
Left Justified
0 7 6 5
PIC18FXX8
ADRESL
0000 00
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