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Architectural Overview

The Z86L972/Z86L973/Z86L974 family is designed to be used in a wide variety of embedded control applications including home appliances, infrared (IR) remote controls, security systems, and wireless keyboards.

Features

? Two independent analog comparators

? Controlled current output

? 489 bytes of RAM

– 233 bytes of general-purpose register-based RAM

– 256 bytes of RAM mapped into the program memory space that can be

used as data RAM or executable RAM

? 4K/8K/16K bytes of ROM

Counter/Timers

? Special architecture to automate generation and reception of complex pulses

or signals:

– Programmable 8-bit counter/timer (T8) with two 8-bit capture registers and

two 8-bit load registers

– Programmable 16-bit counter/timer (T16) with one 16-bit capture register

pair and one 16-bit load register pair

– Programmable input glitch filter for pulse reception

? One general-purpose 8-bit counter/timer (T1) with 6-bit prescaler

Input/Output and Interrupts

? Thirty-two I/Os, twenty-nine of which are bidirectional I/Os with programmable

resistive pull-up transistors (24 I/Os are available in the 28-pin configuration)

? Sixteen I/Os are selectable as stop-mode recovery sources

? Six interrupt vectors with nine interrupt sources

– Three external sources

– Two comparator interrupts

– Three timer interrupts

– One low-battery detector flag

Operating Characteristics

? 8-MHz operation

? 2.3 V to 5.5 V operating voltage

? Low power consumption with three standby modes:

– Stop

– Halt

– Low Voltage Standby

? Low-battery detection flag

? Low-voltage protection circuit (also known as VBO, or voltage brownout,

circuit)

? Watch-dog timer and power-on reset circuits

User-Programmable Option Bits

? Clock source—RC/other (LC, resonator, or crystal)

? Watch-dog timer permanently enable

? 32-kHz crystal

? Port 20–27 pull-up resistive transistor

? Port 40–42 pull-up resistive transistor

? Port 44–47 pull-up resistive transistor

? Port 50–51 pull-up resistive transistor

? Port 54–57 pull-up resistive transistor

? Port 60–63 pull-up resistive transistor

? Port 64–67 pull-up resistive transistor