PIC12F683
EXAMPLE 4-2:
ULTRA LOW-POWER
4.2.4
PIN DESCRIPTIONS AND DIAGRAMS
WAKE-UP INITIALIZATION
Each GPIO pin is multiplexed with other functions. The
pins and their combined functions are briefly described
here. For specific information about individual functions
such as the comparator or the A/D, refer to the
appropriate section in this data sheet.
BCF
STATUS,RP0
;Bank 0
;Set GP0 data latch
;Turn off
; comparator
;Bank 1
BSF
GPIO,0
MOVLW
MOVWF
BSF
BCF
BCF
CALL
BSF
BSF
H’7’
CMCON0
STATUS,RP0
ANSEL,0
TRISIO,0
CapDelay
PCON,ULPWUE
IOC,0
;GP0 to digital I/O
;Output high to
; charge capacitor
;Enable ULP Wake-up
;Select GP0 IOC
;GP0 to input
;Enable interrupt
; and clear flag
;Wait for IOC
4.2.4.1
GP0/AN0/CIN+/ICSPDAT/ULPWU
Figure 4-1 shows the diagram for this pin. The GP0 pin
is configurable to function as one of the following:
• a general purpose I/O
BSF
TRISIO,0
B’10001000’
INTCON
• an analog input for the A/D
MOVLW
MOVWF
SLEEP
• an analog input to the comparator
• an analog input to the Ultra Low-Power Wake-up
• In-Circuit Serial Programming data
FIGURE 4-1:
BLOCK DIAGRAM OF GP0
Analog
Input Mode(1)
VDD
Data Bus
D
Q
Q
Weak
CK
WR
WPU
GPPU
RD
WPU
VDD
D
Q
Q
I/O pin
WR
CK
GPIO
VSS
-
+
VT
D
Q
Q
WR
TRISIO
CK
IULP
0
1
RD
TRISIO
Analog
Input Mode(1)
VSS
ULPWUE
RD
GPIO
D
Q
Q
Q
D
D
CK
WR
IOC
Q3
EN
RD
IOC
Q
EN
Interrupt-on-
Change
RD GPIO
To Comparator
To A/D Converter
Note 1: Comparator mode and ANSEL determines Analog Input mode.
DS41211B-page 34
Preliminary
2004 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
