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MB90210 Series
s PROGRAMMING FOR MB90P214A/P214B/W214A/W214B
In EPROM mode, the MB90P214A/P214B/W214A/W214B functions equivalent to the MBM27C1000. This
allows the EPROM to be programmed with a general-purpose EPROM programmer by using the dedicated
socket adapter (do not use the electronic signature mode).
1. Program Mode
When shipped from Fujitsu, and after each erasure, all bits (64 K
× 8 bits) in the MB90P214A/P214B/W214A/
W214B are in the “1” state. Data is written to the ROM by selectively programming “0’s” into the desired bit
locations. Bits cannot be set to “1” electrically.
2. Programming Procedure
(1) Set the EPROM programmer to MBM27C1000.
(2) Load program data into the EPROM programmer at 10000H to 1FFFFH.
Note that ROM addresses FF0000H to FFFFFFH in the operation mode in the MB90P214A/P214B/W214A/
W214B series assign to 10000H to 1FFFFH in the EPROM mode (on the EPROM programmer).
(3) Mount the MB90P214A/P214B/W214A/W214B on the adapter socket, then fit the adapter socket onto the
EPROM programmer. When mounting the device and the adapter socket, pay attention to their mounting
orientations.
(4) Start programming the program data to the device.
(5) If programming has not successfully resulted, connect a capacitor of approx. 0.1
F between VCC and GND,
between VPP and GND.
(6) Since the MB90P214A and MB90W214A have CMOS-level input, programming to them may be impossible
depending on the output level of the general-purpose programmer. In that case, connect a pull-up resistor
to the adapter socket side.
Note: The mask ROM products (MB90214) does not support EPROM mode. Data cannot, therefore, be read by
the EPROM programmer.
FFFFFFH
10000H*
1FFFFH*
Operation mode
EPROM mode
(Corresponding addresses on the EPROM mode)
FF0000H
* : Be sure to set the programming, the start address and the stop address on the EPROM programmer to 10000H/1FFFFH.