Datasheet

PIC16(L)F1847
DS40001453E-page 134  2011-2013 Microchip Technology Inc.
14.3 Register Definitions: FVR Control
TABLE 14-1: SUMMARY OF REGISTERS ASSOCIATED WITH THE FIXED VOLTAGE REFERENCE
REGISTER 14-1: FVRCON: FIXED VOLTAGE REFERENCE CONTROL REGISTER
R/W-0/0 R-q/q R/W-0/0 R/W-0/0 R/W-0/0 R/W-0/0 R/W-0/0 R/W-0/0
FVREN
(1)
FVRRDY
(2)
TSEN
(3)
TSRNG
(3)
CDAFVR<1:0>
(1)
ADFVR<1:0>
(1)
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set ‘0’ = Bit is cleared q = Value depends on condition
bit 7 FVREN: Fixed Voltage Reference Enable bit
(1)
1 = Fixed Voltage Reference is enabled
0 = Fixed Voltage Reference is disabled
bit 6 FVRRDY: Fixed Voltage Reference Ready Flag bit
(2)
1 = Fixed Voltage Reference output is ready for use
0 = Fixed Voltage Reference output is not ready or not enabled
bit 5 TSEN: Temperature Indicator Enable bit
(3)
1 = Temperature Indicator is enabled
0 = Temperature Indicator is disabled
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 CDAFVR<1:0>: Comparator FVR Buffer Gain Selection bits
(1)
11 = Comparator FVR Buffer Gain is 4x, with output VCDAFVR = 4x VFVR
(4)
10 = Comparator FVR Buffer Gain is 2x, with output VCDAFVR = 2x VFVR
(4)
01 = Comparator FVR Buffer Gain is 1x, with output VCDAFVR = 1x VFVR
00 = Comparator FVR Buffer is off
bit 1-0 ADFVR<1:0>: ADC FVR Buffer Gain Selection bit
(1)
11 = ADC FVR Buffer Gain is 4x, with output VADFVR = 4x VFVR
(4)
10 = ADC FVR Buffer Gain is 2x, with output VADFVR = 2x VFVR
(4)
01 = ADC FVR Buffer Gain is 1x, with output VADFVR = 1x VFVR
00 = ADC FVR Buffer is off
Note 1: To minimize current consumption when the FVR is disabled, the FVR buffers should be turned off by clear-
ing the Buffer Gain Selection bits.
2: FVRRDY is always ‘1’ for the PIC16F1847 devices.
3: See Section 15.0 “Temperature Indicator Module” for additional information.
4: Fixed Voltage Reference output cannot exceed V
DD.
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on page
FVRCON FVREN FVRRDY TSEN TSRNG CDAFVR>1:0> ADFVR<1:0> 134
Legend: Shaded cells are unused by the Fixed Voltage Reference module.