PIC16C717-I/SS View Datasheet(PDF) - Microchip Technology
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PIC16C717-I/SS Datasheet PDF : 200 Pages
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PIC16C717/770/771
10.0 VOLTAGE REFERENCE
MODULE AND LOW-VOLTAGE
DETECT
The Voltage Reference module provides reference volt-
ages for the Brown-out Reset circuitry, the Low-voltage
Detect circuitry and the A/D converter.
The source for the reference voltages comes from the
bandgap reference circuit. The bandgap circuit is ener-
gized anytime the reference voltage is required by the
other sub-modules, and is powered down when not in
use. The control registers for this module are LVDCON
and REFCON, as shown in Register 10-1 and
Figure 10-2.
REGISTER 10-1: LOW-VOLTAGE DETECT CONTROL REGISTER (LVDCON: 9Ch)
U-0
—
bit7
U-0
R-0
R/W-0
—
BGST
LVDEN
bit 7-6: Unimplemented: Read as ’0’
R/W-0
LV3
R/W-1
LV2
R/W-0
LV1
R/W-1
LV0
bit0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
bit 5:
BGST: Bandgap Stable Status Flag bit
1 = Indicates that the bandgap voltage is stable, and LVD interrupt is reliable
0 = Indicates that the bandgap voltage is not stable, and LVD interrupt should not be enabled
bit 4:
bit 3-0:
LVDEN: Low-voltage Detect Power Enable bit
1 = Enables LVD, powers up bandgap circuit and reference generator
0 = Disables LVD, powers down bandgap circuit if unused by BOR or VRH/VRL
LV<3:0>: Low Voltage Detection Limit bits (1)
1111 = External analog input is used
1110 = 4.5V
1101 = 4.2V
1100 = 4.0V
1011 = 3.8V
1010 = 3.6V
1001 = 3.5V
1000 = 3.3V
0111 = 3.0V
0110 = 2.8V
0101 = 2.7V
0100 = 2.5V
0011 = Reserved. Do not use.
0010 = Reserved. Do not use.
0001 = Reserved. Do not use.
0000 = Reserved. Do not use.
Note 1: These are the minimum trip points for the LVD. See Table 15-3 for the trip point tolerances. Selection of
reserved setting may result in an inadvertent interrupt.
© 1999 Microchip Technology Inc.
Advanced Information
DS41120A-page 109
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