Datasheet

PIC16C9XX
DS30444E - page 88  1997 Microchip Technology Inc.
FIGURE 12-6: FLOWCHART OF A/D OPERATION
TABLE 12-2: 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
Power-on
Reset
Value on all
other Resets
0Bh, 8Bh,
10Bh, 18Bh
INTCON GIE PEIE
T0IE INTE RBIE T0IF INTF RBIF
0000 000x 0000 000u
0Ch PIR1 LCDIF ADIF — — SSPIF CCP1IF TMR2IF TMR1IF
00-- 0000 00-- 0000
8Ch PIE1
LCDIE ADIE — — SSPIE CCP1IE TMR2IE TMR1IE
00-- 0000 00-- 0000
1Eh ADRES A/D Result Register
xxxx xxxx uuuu uuuu
1Fh ADCON0 ADCS1 ADCS0 CHS2 CHS1 CHS0 GO/DONE
(1)
ADON
0000 0000 0000 0000
9Fh ADCON1 — — — — — PCFG2 PCFG1 PCFG0
---- -000 ---- -000
05h PORTA
— — RA5 RA4 RA3 RA2 RA1 RA0
--0x 0000 --0u 0000
85h TRISA
— — PORTA Data Direction Control Register
--11 1111 --11 1111
Legend: x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used for A/D conversion.
Note 1: Bit1 of ADCON0 is reserved, always maintain this bit clear.
Acquire
ADON = 0
ADON = 0?
GO = 0?
A/D Clock
GO = 0
ADIF = 0
Abort Conversion
SLEEP
Power-down A/D
Wait 2 T
AD
Wake-up
Yes
No
Yes
No
No
Yes
Finish Conversion
GO = 0
ADIF = 1
Device in
No
Yes
Finish Conversion
GO = 0
ADIF = 1
Wait 2 TAD
Stay in Sleep
Selected Channel
= RC?
SLEEP
No
Yes
Instruction?
Start of A/D
Conversion Delayed
1 Instruction Cycle
From Sleep?
Power-down A/D
Yes
No
Wait 2 TAD
Finish Conversion
GO = 0
ADIF = 1
SLEEP?