User manual

AN020201-0904 Abstract
1
Application Note
Battery-Level Detection in Z8 GP MCU Peripherals
Abstract
This Application Note discusses the enhanced peripherals of the ZGP323 and
ZGR323 devices, which are useful for battery-operated applications such as uni -
versal remote controls. This document focuses on low and high battery voltage
detection of fered by the synchronized T8 and T16 timers.
Z8 GP Application Board Overview
ZiLOG’ s ZGP323 and ZGR323 devices are one-time programmable (OTP) infra -
red m icrocontrollers. With 237 bytes of general-purpose RAM, 2.0 –3 .6 V voltage
range, high and low voltage detect ion , and up to 32 KB of OTP, ZiLOG’s CMOS
microcontrollers offer fast execution, efficient use of memory, sophisticated inter-
rupts, input/output bit-manipulation capabilities, automated pulse generation/
reception, and internal key-scan pull-up transistors.
• Up to 32 KB OTP
• Low power consumption—6 mW (typical)
• 2.0–3.6 V operating voltage
• Three standby modes:
– STOP—2 µA (typical)
– HALT—0.8 mA (typical)
• Low voltage
• Intelligent counter/timer architecture:
– One programmable 8-bit counter/timer with two capture registers and two
load registers
– One programmable 16-bit counter/timer with one 16-bit register pair and
one 16-bit load register pair
• Programmable input glitch filter for pulse reception
• Six priority interrupts:
– Three external interrupts
– Two interrupts assigned to counter/timers
– One low-voltage detection interrupt
• Low battery voltage detection
• High battery voltage detection
• Programmable Watch-Dog Timer/Power-On Reset (WDT/POR) circuits