ZLF645 MAXIM [Maxim Integrated Products], ZLF645 Datasheet - Page 9

• Manufacturer Part Number: ZLF645
• Description: Flash MCUs with Learning Amplification
• Manufacturer: MAXIM [Maxim Integrated Products]

Architectural Overview
PS026408-1208
Features
Maxim’s ZLF645 Series of Flash MCU’s are members of the Crimzon
microcontrollers. This series provides a directly-compatible code upgrade path to other
Crimzon MCUs, offers a robust learning function, and features up to 64 KB Flash memory
and 1K general-purpose Random Access Memory (RAM). Two timers allow the
generation of complex signals while performing other counting operations.
A Universal Asynchronous Receiver/Transmitter (UART) allows the ZLF645 MCU to
function as a slave/master database chip. When the UART is not in use, the Baud Rate
Generator (BRG) can be used as a third timer. Enhanced Stop Mode Recovery features
allow the ZLF645 MCU to recover from STOP mode on any change of logic and on any
combination of the 12 SMR inputs. The SMR source can also be used as an interrupt
source.
Many high-end remote control units offer a learning function. A learning function allows a
replacement remote unit to learn infrared signals from the original remote unit and
regenerate the signal. However, the amplifying circuits of many learning remotes are
expensive and are not tuned well. The ZLF645 MCU is the first chip to offer a built-in
tuned amplification circuit in a wide range of positions and battery voltages. The only
external component required is a photodiode.
The ZLF645 MCU greatly reduces the system cost and improves learning function
reliability. With all new features, the ZLF645 MCU is excellent for infrared remote 
control and other MCU applications.
Table 1
features are listed below the table.
Table 1. ZLF645 Flash MCU Features
Device
ZLF645 Flash
MCU
*
General-purpose registers implemented as RAM.
lists the memory, I/O, and power features of the ZLF645 Flash MCU. Additional
Flash (KB)
32 or 64
RAM*
512 B or 1 K
I/O Lines
16, 24, or 40
Product Specification
Architectural Overview
®
family of infrared
Voltage
Range
2.0 V–3.6 V
1