HD404324FS datasheet(82/103 Pages) RENESAS

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HD404054 Series/HD404094 Series

Programming the Built-In PROM

The MCU’s built-in PROM is programmed in PROM mode. PROM mode is set by pulling

TEST, M

0, and

1 low, and RESET low as shown in figure 63.

In PROM mode, the MCU does not operate, but it can be

programmed in the same way as any other commercial 27256-type EPROM using a standard PROM

programmer and an 42-to-28-pin socket adapter. Recommended PROM programmers and socket adapters

of the HD4074054 and HD4074094 are listed in table 27.

Since an HMCS400-series instruction is ten bits long, the HMCS400-series MCU has a built-in conversion

circuit to enable the use of a general-purpose PROM programmer. This circuit splits each instruction into

five lower bits and five upper bits that are read from or written to consecutive addresses. This means that

if, for example, 4-kwords of built-in PROM are to be programmed by a general-purpose PROM

programmer, a 8-kbyte address space ($0000–$7FFF) must be specified.

Address

A0 to A14

Data

O0 to O7

VPP

GND

VCC

O0 to O7

A0 to A14

VPP

RESET

TEST

VCC

OSC1

HD4074054

HD4074094

Figure 63 PROM Mode Connections

Table 27

Recommended PROM Programmers and Socket Adapters

PROM Programmer

Socket Adapter

Manufacturer

Model Name

Package

Model Name

Manufacturer

DATA I/O Corp.

121B

DP-42S

HS4654ESS01H

Hitachi

AVAL Corp.

PKW-1000

FP-44A

HS4654ESH01H

Hitachi

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