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ATJ2085X integrates 8-bit MCU with on-chip ICE support. Instruction set is compatible with Z80.
Process capability is controlled by software Up to 60 MHz.
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ATJ2085X supports 24.576MHz crystal, which is the system clock source. A low jitter PLL referenced to 24.576MHz is used to generate clock for DSP and for serial communication protocols such as USB, UART, etc. The clock used in serial communications is 48MHz so the PLL generates frequency at multiple of 48MHz to support DSP and serial communication simultaneously. Another PLL referenced to 24.576MHz is used to generate 22.5792MHz for sample rate 44.1K/22.05KHz/11.025KHz.
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On the system diagram, the RTC clock is separate. However, the CPU clock has to be synchronised with the main clock, so overclocking by changing the crystal is not possible.