參數(shù)資料
型號: PIC16LC712T
廠商: Microchip Technology Inc.
英文描述: 8-Bit CMOS Microcontrollers with A/D Converter and Capture/Compare/PWM
中文描述: 8位CMOS微控制器與A / D轉換器和捕捉/比較/ PWM
文件頁數(shù): 50/108頁
文件大小: 1810K
代理商: PIC16LC712T
PIC16C712/716
DS41106A-page 50
Preliminary
1999 Microchip Technology Inc.
8.4
A/D Conversions
8.5
Use of the CCP Trigger
An A/D conversion can be started by the “special event
trigger” of the CCP1 module. This requires that the
CCP1M3:CCP1M0 bits (CCP1CON<3:0>) be pro-
grammed 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 minimal software overhead (moving the ADRES to
the desired location). 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.
TABLE 8-2
SUMMARY OF A/D REGISTERS
Note:
The GO/DONE bit should
NOT
be set in
the same instruction that turns on the A/D.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR,
BOR
Value on all
other Resets
05h
PORTA
INTCON
GIE
(1)
T0IE
RA4
INTE
RA3
RBIE
RA2
T0IF
RA1
INTF
RA0
RBIF
--xx xxxx
--xu uuuu
0Bh,8Bh
PEIE
0000 000x
0000 000u
0Ch
PIR1
ADIF
CCP1IF
TMR2IF
TMR1IF
-0-- -000
-0-- -000
1Eh
ADRES
A/D Result Register
xxxx xxxx
uuuu uuuu
1Fh
ADCON0
ADCS1
ADCS0
CHS2
CHS1
CHS0
GO/DONE
ADON
0000 00-0
0000 00-0
85h
TRISA
PIE1
(1)
PORTA Data Direction Register
---1 1111
---1 1111
8Ch
ADIE
CCP1IE
TMR2IE
TMR1IE
-0-- -000
-0-- 0000
9Fh
Legend:
Note 1:
Reserved bits; Do Not Use.
ADCON1
PCFG2
PCFG1
PCFG0
---- -000
---- -000
x
= unknown,
u
= unchanged,
-
= unimplemented read as '0'. Shaded cells are not used for A/D conversion.
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