HD404364 查看數據表（PDF） - Renesas Electronics

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HD404364

4-bit HMCS400-Series microcomputer

Renesas Electronics 

HD404369 Series

Programming the Built-In PROM

The MCU’s built-in PROM is programmed in PROM mode. PROM mode is set by pulling RESET, M0,

and M1 low, as shown in figure 79. 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 a

100-to-28-pin socket adapter. Recommended PROM programmers and socket adapters are listed in table

29.

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, 16 kwords of built-in PROM are to be programmed by a general-purpose PROM programmer,

a 32-kbyte address space ($0000–$7FFF) must be specified.

CE, OE

A14–A0

O4–O0

M0

M1

RESET

VCC

GND

VPP

HD407A4369

PROM mode pins

Control signals

Address bus

O7

O6

O5

O4–O0

O7–O0

Data bus

Socket adapter

Figure 79 PROM Mode Connections

VCC

GND

VPP

PROM programmer

93

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