MC68HC908LB8_05 Datasheet, PDF (119/234 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Chapter 12
Low-Voltage Inhibit (LVI)
12.1 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.
12.2 Features
Features of the LVI module include:
• Programmable LVI reset
• Programmable power consumption
• Selectable LVI trip voltage
• Programmable stop mode operation
12.3 Functional Description
Figure 12-1 shows the structure of the LVI module. LVISTOP, LVIPWRD, 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
LVIOUT
LVI RESET
Figure 12-1. LVI Module Block Diagram
MC68HC908LB8 Data Sheet, Rev. 1
Freescale Semiconductor
119