MC68HC08LT8 Datasheet, PDF (121/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 13
Low-Voltage Inhibit (LVI)
13.1 Introduction
This section describes the low-voltage inhibit (LVI) module, which monitors the voltage on the V_DD pin
and can force a reset when the V_DD voltage falls below the LVI trip falling voltage, V_TRIPF.
13.2 Features
Features of the LVI module include:
• Programmable LVI interrupt and reset
• Selectable LVI trip voltage
• Programmable stop mode operation
13.3 Functional Description
Figure 13-1 shows the structure of the LVI module.
V_DD
DEFAULT
ENABLED
LVIPWRD
FROM CONFIG1
STOP INSTRUCTION
FROM CONFIG1
LVIRSTD
LVISTOP
FROM CONFIG1
LOW V_DD
DETECTOR
LVISEL[1:0]
FROM CONFIG2
V_DD > V_TRIPR = 0
V_DD ≤ V_TRIPF = 1
FROM LVISR
LVIIE
EDGE
DETECT
LATCH _CLR
LVI RESET
LVI
INTERRUPT
REQUEST
LVIOUT
LVIIACK
LVIIF
TO LVISR
FROM LVISR TO LVISR
Figure 13-1. LVI Module Block Diagram
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
121