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• Word (32-bit) programming
• Embedded hardware program and erase algorithm
— Uses internal oscillator to time program and erase pulses. Pulses are timed
independently of system clock frequency
— Automatically performs margin reads
• External Flash program or erase enable inputs for block 0 or entire Flash array
(B0EPEE and EPEE)
• Low power disable via an external signal or UC3F register bit
• Censor mode for Flash memory array access restriction with a user bypass for
unrestricted array access
19.1 UC3F Interface
The UC3F module contains a memory interface (MI) and an array core. The MI controls
access of the array core and register block in the UC3F module.
The interface signals to the UC3F module consist of address inputs, data inputs, data
outputs, a simple set of control signals for read and write operations, a set of register selects,
and a set of register outputs which are used by the BIU. Three required supply pins power
the module: V
, V
DDF
The UC3F module is a fully asynchronous module and does not require a clock input for
operation. All required clocks are generated internally using an internal oscillator, external
test clock input, or internal delay circuits.
19.1.1
External Interface
The UC3F EEPROM module uses external pins to provide power supplies. These pins are
listed in Table 19-1.
.
Mnemonic
I/O Type
V
Power Pin
DDF
V
Ground Pin
SSF
VFLASH
Power Pin
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
, and V
.
SSF
FLASH
Table 19-1. UC3F External Interface Signals
Description
UC3F power supply
To reduce noise in the read path no other circuits should be
connected to the UC3F V
isolated from all other V
voltage range during operation is 2.6 V ± 0.1 V.
UC3F ground
To reduce noise in the read path no other circuits should be
connected to the UC3F V
from all other V
UC3F 5-V power supply VFLASH provides a 5-V supply to the UC3F module which is used
for read, program, and erase operations. VFLASH must be in the
range of 4.75 V to 5.25 V (5 V ± 5%) during operation.
Chapter 19. CDR3 Flash (UC3F) EEPROM
Comments
supply pin.This V
DDF
pins inside the device. The specified
DD
supply. This V
SSF
pins inside the device.
SS
UC3F Interface
pin must be
DD
pin must be isolated
SS
19-3
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