PIC16LC773-04SLASHSP datasheet(113/200 Pages) MICROCHIP

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PIC16C77X

Advance Information

DS30275A-page 113

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,

shown

Figure 10-1

and

Figure 10-2.

FIGURE 10-1: LVDCON: LOW-VOLTAGE DETECT CONTROL REGISTER

U-0

R-0

R/W-0

R/W-1

R/W-0

R/W-1

—

BGST

LVDEN

LV3

LV2

LV1

LV0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n =Value at POR reset

bit7

bit0

bit 7-6: Unimplemented: Read as '0'

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:

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

bit 3-0: LV3:LV0: 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

Note 1: These are the minimum trip points for the LVD, see Table 15-3 for the trip point tolerances. Selection

of an unused setting may result in an inadvertant interrupt.

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