ROAMING FLEX™ chip SIGNAL PROCESSOR

The FLEX™ protocol is a multi-speed, high-performance protocol adopted by leading service  providers worldwide as a de facto paging standard. The FLEX protocol gives service providers  the increased capacity, added reliability, and enhanced pager battery performance they need  today. It also provides an upward migration path to the service provider that is completely  transparent to the end user.
The MC68181 Roaming FLEX™ chip IC is part of a total solution available from Motorola for  providing FLEX capabilities in a low-power, low-cost system. The FLEX™ chip simplifies  implementation of a FLEX paging device by interfacing with any of several off-the-shelf paging  receivers, and any of several off-the-shelf host microcontroller/microprocessors. The primary  function of the FLEX™ chip is to process information received and demodulated from a FLEX-radio paging channel, select messages addressed to the paging device, and communicate the  message information to the host. The host controls receiver channel selection, and interprets the  message information in an appropriate manner (numeric, alphanumeric, binary, etc.) and  handles all the I/O activity.

FEATURES
• FLEX paging protocol signal processor
• Sixteen programmable user address words
• Sixteen temporary addresses
• Sixteen operator messaging addresses
• 1600, 3200, and 6400 bits-per-second decoding
• Any-phase or single-phase decoding
• Uses standard Serial Peripheral Interface (SPI) in Slave mode
• Allows low current Stop mode operation of host processor
• Highly programmable receiver control
• Real-time clock time base
• FLEX software fragmentation and group messaging support
• Real time clock over-the-air update support
• Compatible with synthesized receivers
• SSID and NID Roaming support
• Low Battery Indication (requires external detector)
• 1.8 to 3.3 V low power operation
• 32-pin Thin Quad Flat Pack (TQFP) package
• Backward compatible with MC68175