Datasheet

PIC16(L)F720/721
DS40001430E-page 86  2010-2013 Microchip Technology Inc.
REGISTER 10-1: FVRCON: FIXED VOLTAGE REFERENCE REGISTER
R-q R/W-0 R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0
FVRRDY FVREN TSEN TSRNG — — ADFVR1 ADFVR0
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
q = Value depends on condition
bit 7 FVRRDY
(1)
: Fixed Voltage Reference Ready Flag bit
0 = Fixed Voltage Reference output is not active or stable
1 = Fixed Voltage Reference output is ready for use
bit 6 FVREN: Fixed Voltage Reference Enable bit
0 = Fixed Voltage Reference is disabled
1 = Fixed Voltage Reference is enabled
bit 5 TSEN: Temperature Indicator Enable bit
(3)
0 = Temperature indicator is disabled
1 = Temperature indicator is enabled
bit 4 TSRNG: Temperature Indicator Range Selection bit
(3)
1 =VOUT = VDD - 4VT (High Range)
0 =V
OUT = VDD - 2VT (Low Range)
bit 3-2 Unimplemented: Read as ‘0’
bit 1-0 ADFVR<1:0>: A/D Converter Fixed Voltage Reference Selection bits
00 = A/D Converter Fixed Voltage Reference Peripheral output is off
01 = A/D Converter Fixed Voltage Reference Peripheral output is 1x (1.024V)
10 = A/D Converter Fixed Voltage Reference Peripheral output is 2x (2.048V)
(2)
11 = A/D Converter Fixed Voltage Reference Peripheral output is 4x (4.096V)
(2)
Note 1: FVRRDY is always ‘1’ for the PIC16F720/721 devices.
2: Fixed Voltage Reference output cannot exceed VDD.
3: See Section 11.0 “Temperature Indicator Module” for additional information.
TABLE 10-2: SUMMARY OF ASSOCIATED FIXED VOLTAGE REFERENCE REGISTERS
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
FVRCON FVRRDY FVREN
TSEN TSRNG — — ADFVR1 ADFVR0
86
Legend: x = unknown, u = unchanged, — = unimplemented read as ‘0’, q = value depends on condition. Shaded
cells are not used for Fixed Voltage Reference.