General Description
The HT9580 is a high performance pager controller which can be used for Chinese Pager system applications. The HT9580 4-in-1 Character Pager Controller combines a POCSAG decoder with a M6502 microprocessor core, 2 Mbits Character ROM and 256 Kbits SRAM to provide both high decoder performance and excellent system flexibility.

Features
• Operating voltage: 2.4V~3.5V
• Temperature range: -30C to +85C
• low power, high performance M6502 core
• low power crystal oscillator control
    - 512/1200/2400 bps data rate operation
• "CCIR Radio Paging Code No.1" (POCSAG) compatible
• 76.8kHz crystal for all available data rates
• High/low system clock switching capability
• 44 Kbytes program ROM
• 848 bytes global data RAM
• Internal 2 Mbits Character ROM
• 256 Kbits internal SRAM
• External option up to 2 Mbits Character ROM or 2 Mbits SRAM
• SED15X(KSX), MC141X and HD66410 series LCD driver compatible interface option
• 46 bytes message buffer
• One 16-bit timer and one 8-bit timer
• Internal 2Hz or 1Hz RTC or Real Time Clock option
• Single buzzer generator output (BZ) with duty cycle control
• low current HALT mode operation
• 16-bit watchdog timer
• Built-in data filter (16-times over-sampling ) and bit clock recovery
• Advanced synchronization algorithm
• 2-bit random and (optional) 4-bit burst error correction for address and message
• Up to 6 user addresses and 6 user frames, independently programmable
• 3 RF power-on timing control pins and Received data inversion (optional)
• Built in SPI circuit
• Out-of-range condition indicator
• One internal 8-bit D/A converter
• Battery fail and battery low detection
• 80-pin LQFP package