MC68HLC908QY4 Datasheet, PDF (85/182 Pages) Motorola, Inc – Microcontrollers

Chapter 10
Low-Voltage Inhibit (LVI)
10.1 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.
10.2 Features
Features of the LVI module include:
• Programmable LVI reset
• Programmable power consumption
• Selectable LVI trip voltage
• Programmable stop mode operation
10.3 Functional Description
Figure 10-1 shows the structure of the LVI module. LVISTOP, LVIPWRD, LVDLVR, and LVIRSTD are
user selectable options found in the configuration register (CONFIG1). See Chapter 5 Configuration
Register (CONFIG).
V_DD
LVIPWRD
FROM CONFIG
STOP INSTRUCTION
FROM CONFIG
LVIRSTD
LVISTOP
FROM CONFIG
LOW V_DD
DETECTOR
V_DD > LVITRIP = 0
V_DD ≤ LVITRIP = 1
LVDLVR
FROM CONFIG
LVIOUT
Figure 10-1. LVI Module Block Diagram
LVI RESET
MC68HLC908QY/QT Family Data Sheet, Rev. 3
Freescale Semiconductor
85