MC68LC302CPU16CT

Microprocessors Overview

The MC68LC302CPU16CT is a low-cost integrated multiprotocol processor based on the M68000 family. It features an on-chip static 68000 core supporting 8- or 16-bit systems, packaged in a 100-pin Thin Quad Flat Pack (TQFP). The device includes a System Integration Block (SIB) with an Independent DMA controller, interrupt controller, parallel I/O ports, and 1152 bytes of dual-port RAM. It also contains three timers, including a watchdog and Periodic Interrupt Timer (PIT), and four programmable chip-select lines. The Communication Processor (CP) provides two full-duplex Serial Communications Controllers (SCCs) supporting HDLC/SDLC, UART, BISYNC, and transparent modes.

Microprocessors Feature Summary

• Static 68000 core architecture enabling operation in low-power and portable applications
• Integrated system control with new standby modes and wake-up capabilities via pins or PIT
• Dual independent serial communication controllers supporting multiple high-level protocols
• On-chip PLL allowing crystal operation at 32 kHz or 4 MHz for reduced power consumption

Microprocessors Applications

• Low power and handheld portable devices
• Space-critical applications such as PCMCIA cards
• Systems requiring two serial channels instead of three
• Intelligent DMA-driven peripheral chips in slave mode

Microprocessors Procurement Notes

Verify the specific suffix 'CPU16' against official NXP documentation to confirm voltage and temperature range specifications. Ensure compatibility with existing 100 TQFP footprints when replacing MC68302 variants. Confirm that the removal of SCC3 and external bus arbitration pins aligns with system design requirements before procurement.

Microprocessors Selection Notes

Select this component for designs needing M68000 compatibility with reduced pin count and lower power consumption compared to the MC68302. It is suitable for applications where one serial channel is unnecessary. Note that external bus mastership is restricted unless operating in CPU disabled mode. Verify package availability and thermal requirements for the specific operating environment.

Microprocessors Part Context

The MC68LC302 is a derivative of the MC68302 Integrated Multiprotocol Processor, designed as a cost-effective alternative. It retains core functionality while removing the third serial communication controller (SCC3) and reducing pin count from 132 to 100. This reduction facilitates use in height-restricted applications like PCMCIA. The device introduces a static core and enhanced low-power modes not present in the original dynamic implementation.

Microprocessors Replacement Considerations

Direct replacement for MC68302 requires accounting for the missing SCC3 and modified pin assignments. External bus arbitration pins are removed; HALT pin must be used for external mastership. Verify software compatibility regarding the absence of SCC3 registers and baud rate generator 3.