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GENERAL DESCRIPTION

The Z89135/136 is a fully integrated, dual processor controller designed for low-cost digital telephone answering machines. The I/O control processor is a Z8? MCU with 24 KB of program memory, two 8-bit counter/timers, and up to 47 I/O pins. The DSP is a 16-bit processor with a 24-bit ALU and accumulator, 512 x 16 bits of RAM, single cycle instructions, and 6K word program ROM plus constants memory. The chip also contains a half-flash 8-bit A/D converter with up to 128 kHz sample rate and 10-bit PWM D/A converter. The sampling rates for the converters are programmable. The precision of the 8-bit A/D may be extended by resampling the data at a lower rate in software.

FEATURES

■ 24 KB of Z8 Program ROM (Z89135)

■ Watch-Dog Timer and Power-On Reset

■ Low Power STOP Mode

■ On-Chip Oscillator which Accepts a Crystal or External

Clock Drive

■ Two 8-Bit Z8 Counter Timers with 6-Bit Prescaler

■ Global Power-Down Mode

■ Low Power Consumption - 200 mW (typical)

■ Two Comparators with Programmable Interrupt Priority

■ Six Vectored, Priority Z8 Interrupts

■ RAM and ROM Protect

■ Clock Speed of 20.48 MHz

■ 16-Bit Digital Signal Processor (DSP)

■ 6K Word DSP Program ROM

■ 512 Words On-Chip DSP RAM

■ 8-Bit A/D Converter with up to 128 kHz Sample Rate

■ 10-Bit PWM D/A Converter (4 kHz to 64 kHz)

■ Three Vectored, Prioritized DSP Interrupts

■ Two DSP Timers to Support Different A/D and

■ D/A Sampling Rates

■ Z8 and DSP Operation in Parallel

■ IBM? PC-Based Development Tools

■ Developer’s Toolbox for T.A.M. Applications