PIC16F720_13 Datasheet, PDF (86/254 Pages) Microchip Technology – 20-Pin Flash Microcontrollers

PIC16(L)F720/721
REGISTER 10-1: FVRCON: FIXED VOLTAGE REFERENCE REGISTER
R-q
R/W-0
R/W-0
R/W-0
U-0
U-0
FVRRDY
FVREN
TSEN
TSRNG
—
—
bit 7
R/W-0
ADFVR1
R/W-0
ADFVR0
bit 0
Legend:
R = Readable bit
W = Writable bit
-n = Value at POR
‘1’ = Bit is set
q = Value depends on condition
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4
bit 3-2
bit 1-0
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
FVREN: Fixed Voltage Reference Enable bit
0 = Fixed Voltage Reference is disabled
1 = Fixed Voltage Reference is enabled
TSEN: Temperature Indicator Enable bit⁽³⁾
0 = Temperature indicator is disabled
1 = Temperature indicator is enabled
TSRNG: Temperature Indicator Range Selection bit⁽³⁾
1 = VOUT = VDD - 4VT (High Range)
0 = VOUT = VDD - 2VT (Low Range)
Unimplemented: Read as ‘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:
2:
3:
FVRRDY is always ‘1’ for the PIC16F720/721 devices.
Fixed Voltage Reference output cannot exceed VDD.
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.
DS41430D-page 86
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