PIC16F684-I/SLG Microchip, PIC16F684-I/SLG Datasheet - Page 71

• Manufacturer Part Number: PIC16F684-I/SLG
• Description: pic, flash, Microcontrollers, Microprocessors, Semiconductors and Actives, ic, mcu
• Manufacturer: Microchip

9.3
The A/D converter module can operate during Sleep.
This requires the A/D clock source to be set to the
internal oscillator. When the RC clock source is
selected, the A/D waits one instruction before starting
the conversion. This allows the SLEEP instruction to be
executed, thus eliminating much of the switching noise
from the conversion. When the conversion is complete,
the GO/DONE bit is cleared and the result is loaded
into the ADRESH:ADRESL registers.
FIGURE 9-5:
9.4
A device Reset forces all registers to their Reset state.
Thus, the A/D module is turned off and any pending
conversion
registers are unchanged.
9.5
An A/D conversion can be started by the “special event
trigger” of the ECCP module. This requires that the
CCP1M3:CCP1M0
programmed as ‘1011’ and that the A/D module is
enabled (ADON bit is set). When the trigger occurs, the
GO/DONE bit will be set, starting the A/D conversion
and the Timer1 counter will be reset to zero. Timer1 is
reset to automatically repeat the A/D acquisition period
with
ADRESH:ADRESL to the desired location).
 2004 Microchip Technology Inc.
minimal
A/D Operation During Sleep
Effects of Reset
Use of the ECCP Trigger
is
software
aborted.
A/D TRANSFER FUNCTION
bits
0V
3FDh
3FCh
3FEh
3FBh
3FFh
004h
003h
002h
001h
000h
overhead
The
(CCP1CON<3:0>)
ADRESH:ADRESL
(moving
1 LSB ideal
Zero-Scale
Transition
Full-Scale Range
Preliminary
the
be
If the A/D interrupt is enabled, the device awakens from
Sleep. If the GIE bit (INTCON<7>) is set, the program
counter is set to the interrupt vector (0004h), if GIE is
clear, the next instruction is executed. If the A/D inter-
rupt is not enabled, the A/D module is turned off,
although the ADON bit remains set.
When the A/D clock source is something other than
RC, a SLEEP instruction causes the present conversion
to be aborted, and the A/D module is turned off. The
ADON bit remains set.
The appropriate analog input channel must be selected
and the minimum acquisition done before the “special
event trigger” sets the GO/DONE bit (starts a
conversion).
If the A/D module is not enabled (ADON is cleared),
then the “special event trigger” will be ignored by the
A/D module, but will still reset the Timer1 counter. See
Section 11.0 “Enhanced Capture/Compare/PWM
(ECCP) Module” for more information.
V
REF
Full-Scale
Transition
1 LSB ideal
Analog Input Voltage
PIC16F684
DS41202C-page 69