參數(shù)資料
型號: PIC16CR74-I/L
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 163/172頁
文件大?。?/td> 2964K
代理商: PIC16CR74-I/L
PIC16CR7X
DS21993C-page 88
2007 Microchip Technology Inc.
11.7
Use of the CCP Trigger
An A/D conversion can be started by the “special event
trigger” of the CCP2 module. This requires that the
CCP2M3:CCP2M0 bits (CCP2CON<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 an appropriate acquisi-
tion time should pass 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 11-2:
SUMMARY OF A/D REGISTERS
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
0Bh,8Bh,
10Bh, 18Bh
INTCON
GIE
PEIE
TMR0IE
INTE
RBIE
TMR0IF
INTF
RBIF
0000 000x 0000 000u
0Ch
PIR1
PSPIF(1)
ADIF
RCIF
TXIF
SSPIF
CCP1IF
TMR2IF TMR1IF 0000 0000 0000 0000
0Dh
PIR2
CCP2IF ---- ---0 ---- ---0
8Ch
PIE1
PSPIE(1)
ADIE
RCIE
TXIE
SSPIE
CCP1IE
TMR2IE TMR1IE 0000 0000 0000 0000
8Dh
PIE2
—CCP2IE ---- ---0 ---- ---0
1Eh
ADRES
A/D Result Register Byte
xxxx xxxx uuuu uuuu
1Fh
ADCON0
ADCS1
ADCS0
CHS2
CHS1
CHS0 GO/DONE
—ADON
0000 00-0 0000 00-0
9Fh
ADCON1
PCFG2
PCFG1
PCFG0 ---- -000 ---- -000
05h
PORTA
RA5
RA4
RA3
RA2
RA1
RA0
--0x 0000 --0u 0000
85h
TRISA
PORTA Data Direction Register
--11 1111 --11 1111
09h
PORTE(2)
RE2
RE1
RE0
---- -xxx ---- -uuu
89h
TRISE(2)
IBF
OBF
IBOV
PSPMODE
PORTE Data Direction Bits
0000 -111 0000 -111
Legend:
x
= unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used for A/D conversion.
Note
1: Bits PSPIE and PSPIF are reserved on the PIC16CR73/76; always maintain these bits clear.
2: These registers are reserved on the PIC16CR73/76.
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