PIC16F627A_09 Datasheet, PDF (71/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
FIGURE 11-2:
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
VREF
Module
R⁽¹⁾
RA2
Op Amp
+
VREF Output
Voltage
Reference
Output
Impedance
Note 1: R is dependent upon the voltage reference configuration VRCON<3:0> and VRCON<5>.
TABLE 11-1: REGISTERS ASSOCIATED WITH VOLTAGE REFERENCE
Address Name Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value On
POR
Value On
All Other
Resets
9Fh
1Fh
85h
Legend:
VRCON VREN VROE VRR
CMCON C2OUT C1OUT C2INV
TRISA TRISA7 TRISA6 TRISA5
- = Unimplemented, read as ‘0’.
—
C1INV
TRISA4
VR3
CIS
TRISA3
VR2
CM2
TRISA2
VR1
CM1
TRISA1
VR0
CM0
TRISA0
000- 0000
0000 0000
1111 1111
000- 0000
0000 0000
1111 1111
© 2009 Microchip Technology Inc.
DS40044G-page 71