Overview of Enhanced Z180 Microprocessor
The datasheet presents information on the ZiLOG 285180/28L180 Enhanced Z180 Microprocessor, designed for improved performance and compatibility. This microprocessor builds on the legacy of the Z80180 models, maintaining compatibility with the ZiLOG Z80 devices.
Key Features
The Enhanced Z180 introduces several features:
- Extended Instruction Set: Code compatible with Zilog Z280S CPU.
- Performance: Offers faster execution speeds and lower electromagnetic interference (EMI).
- Power Efficiency: Includes STANDBY, SLEEP, and SYSTEM STOP modes to minimize power consumption.
- Clock Speeds: Variable speeds of 10, 20, and 33 MHz with an onboard clock-doubler feature.
- Operating Range & Temperature: Functions at 5V, with a reduced voltage option at 3.3V for 20 MHz and temperature ranges of 0°C to +70°C and -40°C to +85°C.
- Packaging: Available in 68-Pin PLCC, 64-Pin DIP, and 80-Pin QFP styles.
- Connectivity & Expansion: Two chain-linked DMA channels, expanded MMU addressing up to 1 MB, and a clocked serial I/O port.
- Counters/Timers & UARTs: Incorporates two 16-bit counter/timers and two enhanced UARTs with up to 512 Kbps transfer rates.
Functional Enhancements
Improvements have been made to the microprocessor’s ASCIs (Asynchronous Communications Interface), DMAs (Direct Memory Access), and standby mode. Notably, the addition of ESCC-like Baud Rate Generators (BRGs) to the ASCIs offers high flexibility and the potential to reduce overrun errors due to a new 4-byte FIFO buffer.
Power Optimization
In addition to performance enhancement, the Enhanced Z180 focuses on power efficiency. The new power-saving modes complement the already low-power consumption of the device during normal operation.
Design Considerations
The processor accommodates various end-user requirements, available in different form factors to fit a range of applications. It also includes integrated controllers for a streamlined operation, alongside specialized generators and buffers enhancing system robustness.
General Circuit Description
Power connections adhere to conventional Vcc (power) and GND (ground) descriptions, while the devices follow VDD (device power) and VSS (device ground) connections. The datasheet includes a Functional Block Diagram to provide a visual layout of the microprocessor’s architecture.
Note: Signals indicated with an overline are active low. This means that when a signal name has an overline, the specified condition of the signal is active when it is at a low voltage level.
ZiLOG Brand Recognition
As a product of ZiLOG, a trusted brand in the industry, this Enhanced Z180 microprocessor is expected to uphold the performance and reliability standards that users of ZiLOG products are accustomed to.
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