HD404054 Datasheet, PDF (81/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

HD404054 Series/HD404094 Series
Warnings
1. Always specify addresses $0000 to $1FFF when programming with a PROM programmer. If address
$2000 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 or 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 (V_PP): 12.5 V and 21 V. Remember that ZTAT™ devices
require a V_PP 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 28.
Table 28 PROM Mode Selection
Pin
Mode
CE
OE
V_PP
Programming
Low
High
V_PP
Verification
High
Low
V_PP
Programming inhibited
High
High
V_PP
O₀–O₇
Data input
Data output
High impedance
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