PIC18F1230 MICROCHIP [Microchip Technology], PIC18F1230 Datasheet - Page 172
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PIC18F1230
Manufacturer Part Number
PIC18F1230
Description
18/20/28-Pin, Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F1230.pdf
(312 pages)
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PIC18F1230/1330
15.5
The selection of the automatic acquisition time and A/D
conversion clock is determined in part by the clock
source and frequency while in a power-managed mode.
If the A/D is expected to operate while the device is in
a power-managed mode, the ACQT2:ACQT0 and
ADCS2:ADCS0 bits in ADCON2 should be updated in
accordance with the clock source to be used in that
mode. After entering the mode, an A/D acquisition or
conversion may be started. Once started, the device
should continue to be clocked by the same clock
source until the conversion has been completed.
If desired, the device may be placed into the
corresponding Idle mode during the conversion. If the
device clock frequency is less than 1 MHz, the A/D RC
clock source should be selected.
Operation in Sleep mode requires the A/D F
be selected. If bits ACQT2:ACQT0 are set to ‘000’ and
a conversion is started, the conversion will be delayed
one instruction cycle to allow execution of the SLEEP
instruction and entry to Sleep mode. The IDLEN bit
(OSCCON<7>) must have already been cleared prior
to starting the conversion.
DS39758B-page 170
Operation in Power-Managed
Modes
RC
Advance Information
clock to
15.6
The ADCON1 and TRISA registers configure the A/D
port pins. The port pins needed as analog inputs must
have their corresponding TRIS bits set (input). If the
TRIS bit is cleared (output), the digital output level (V
or V
The A/D operation is independent of the state of the
CHS1:CHS0 bits and the TRIS bits.
Note 1: When reading the PORT register, all pins
OL
) will be converted.
2: Analog levels on any pin defined as a
Configuring Analog Port Pins
configured as analog input channels will
read as cleared (a low level). Pins
configured as digital inputs will convert as
analog inputs. Analog levels on a digitally
configured
converted.
digital input may cause the digital input
buffer to consume current out of the
device’s specification limits.
© 2006 Microchip Technology Inc.
input
will
be
accurately
OH
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