PIC16F627A_05 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
—
VR3
VR2
VR1
VR0 000- 0000 000- 0000
CMCON C2OUT C1OUT C2INV C1INV CIS
CM2 CM1
CM0 0000 0000 0000 0000
TRISA TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 1111 1111 1111 1111
- = Unimplemented, read as ‘0’.
© 2005 Microchip Technology Inc.
DS40044D-page 69