HD404459

HD404459 Series Description The HD404459 Series is a member of the 4-bit HMCS400-series microcomputers with large-capacity memory and architecture providing high program productivity. Each microcomputer has a 32-kHz oscillator for clock, low-voltage (1.8 V) operating mode, and four low-power dissipation modes. The HD404459 Series includes three chips: the HD404458 with an 8-kword ROM; the HD404459 with a 16-kword ROM; and the HD4074459 with a 16-kword PROM (ZTATTM version). The HD4074459 is a PROM version (ZTATTM microcomputer). A program can be written to the PROM by a PROM writer, thus dramatically shortening system development periods and turnaround time (ZTAT TM versions are 27256-compatible). ZTAT TM: Zero Turn Around Time ZTAT is a trademark of Hitachi, Ltd. Features 8,192-word × 10-bit ROM (HD404458) 16,384-word × 10-bit ROM (HD404459 and HD4074459) 512-digit × 4-bit RAM (HD404458) 768-digit × 4-bit RAM (HD404459 and HD4074459) 56 I/O pins, including seven input pins Four timer/counters 1-channel × 8-bit input capture circuit Three timer outputs (including two PWM outputs) Two event counter inputs (including one double-edge function) 8-bit clock-synchronous serial interface Eight wakeup inputs Four-channel voltage comparator (external or internal reference power supply can be selected) Built-in oscillators  Main clock: 4-MHz ceramic or crystal oscillator (an external clock is also possible)  Subclock: 32.768-kHz crystal w w .D w t a S a...