The HD404358 Series is a 4-bit HMCS400-Series microcomputer designed to increase program productivity and also incorporate large-capacity memory. Each microcomputer has an A/D converter, input capture timer, and two low-power dissipation modes. The HD404358 Series includes seven chips: the HD404354, HD40A4354 with 4-kword ROM; the HD404356, HD40A4356 with 6-kword ROM; the HD404358, HD40A4358 with 8-kword ROM; the HD407A4359 with 16-kword PROM. The HD40A4354, HD40A4356, HA40A4358, and HD407A4359 are high speed versions (minimum instruction cycle time: 0.47 µs) The HD407A4359 is a PROM version (ZTAT microcomputer). A program can be written to the PROM by a PROM writer, which can dramatically shorten system development periods and smooth the process from debugging to mass production. (The ZTAT version is 27256-compatible.) ZTAT: Zero Turn Around Time ZTAT is a trademark of Hitachi Ltd.
The HD404358 series is a 4‑bit HMCS400‑Series microcomputer family from Hitachi. Each device includes an on‑chip 8‑bit × 8‑channel A/D converter, multiple timers, a serial interface and two low‑power dissipation modes. The series offers several ROM sizes (4 k‑word, 6 k‑word, 8 k‑word and a 16 k‑word PROM version) and a standard 384‑digit × 4‑bit RAM.
The document provides detailed pin arrangements, pin descriptions, memory maps for ROM and RAM, ordering information, and cautions for proper use. It is intended for designers and engineers who need precise electrical and functional specifications of the HD404358 family.
| Total pins | 34 |
|---|---|
| Input‑only pins | 1 |
| I/O pins | 33 |
| Power supply voltage | 2.7 V to 6.0 V |
| Instruction cycle time (high‑speed) | 0.47 µs (fosc = 8.5 MHz) |
| Instruction cycle time (standard) | 0.8 µs (fosc = 5 MHz) |
| On‑chip A/D converter | 8‑bit × 8‑channel |
| Timers | Three timers |
| Low‑power modes | Two (Standby, Stop) |
| Serial interface | 8‑bit clock‑synchronous, 1 channel |
| ROM size (HD404358) | 8,192 words |
| RAM size | 384‑digit × 4‑bit |
The high‑speed version runs an instruction cycle in 0.47 µs when the oscillator frequency is 8.5 MHz.
The device has 34 pins total, of which 33 are input/output pins and one is an input‑only pin.
The microcontrollers operate from 2.7 V up to 6.0 V.
ROM options range from 4 k‑word to 8 k‑word; the HD404358 model provides an 8,192‑word ROM.