HD404354 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD404354

4-bit HMCS400-series microcomputer

Hitachi -> Renesas Electronics 

HD404358 Series

Warnings

1. Always specify addresses $0000 to $7FFF when programming with a PROM programmer. If address

$8000 or higher is accessed, the PROM may not be programmed or verified correctly. Set all data in

unused addresses to $FF.

Note that the plastic-package version cannot be erased and reprogrammed.

2. Make sure that the PROM programmer, socket adapter, and LSI are aligned correctly (their pin 1

positions match), otherwise overcurrents may damage the LSI. Before starting programming, make sure

that the LSI is firmly fixed in the socket adapter and the socket adapter is firmly fixed onto the

programmer.

3. PROM programmers have two voltages (VPP): 12.5 V and 21 V. Remember that ZTAT™ devices

require a VPP of 12.5 V—the 21-V setting will damage them. 12.5 V is the Intel 27256 setting.

Programming and Verification

The built-in PROM of the MCU can be programmed at high speed without risk of voltage stress or damage

to data reliability.

Programming and verification modes are selected as listed in table 30.

For details of PROM programming, refer to the following Notes on PROM Programming section.

Table 30 PROM Mode Selection

Pin

Mode

CE

OE

VPP

Programming

Low

High

VPP

Verification

High

Low

VPP

Programming inhibited

High

High

VPP

O0–O4

Data input

Data output

High impedance

81

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