HD6475328-CP10 Datasheet, PDF (311/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

Address in MCU mode
H'0000
Address in PROM mode
H'0000
On-chip ROM
H'7FFF
H'7FFF
Figure 17-3 Memory Map in PROM Mode
17.3 Programming
The write, verify, and inhibited sub-modes of the PROM mode are selected as shown in
table 17-4.
Table 17-4 Selection of Sub-Modes in PROM Mode
Pins
Mode
CE
OE
VPP VCC
07 to 00
Write
Low High VPP VCC Data input
Verify
High Low VPP VCC Data output
Programming inhibited High High VPP VCC High-impedance
Note: The VPP and VCC pins must be held at the VPP and VCC voltage levels.
A14 to A0
Address input
Address input
Address input
The H8/532 PROM uses the same, standard read/write specifications as the HN27C256 and
HN27256.
17.3.1 Writing and Verifying
An efficient, high-speed programming procedure can be used to write and verify PROM data.
This procedure writes data quickly without subjecting the chip to voltage stress and without
sacrificing data reliability. It leaves the data H'FF written in unused addresses.
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