at52br3224 ATMEL Corporation, at52br3224 Datasheet - Page 4

• Manufacturer Part Number: at52br3224
• Description: Single Plane Flash Combined With Sram
• Manufacturer: ATMEL Corporation

32-megabit Flash
Description
4
AT52BR3224(T)/3228(T)
The 32-megabit Flash memory is organized as 2,097,152 words of 16 bits each. The
x16 data appears on I/O0 - I/O15. The memory is divided into 71 sectors for erase oper-
ations. The device features CE and OE control signals to avoid any bus contention. This
device can be read or reprogrammed using a single power supply, making it ideally
suited for in-system programming.
The device powers on in the read mode. Command sequences are used to place the
device in other operation modes such as program and erase. The device has the capa-
bility to protect the data in any sector (see “Sector Lockdown” section).
To increase the flexibility of the device, it contains an Erase Suspend and Program Sus-
pend feature. This feature will put the erase or program on hold for any amount of time
and let the user read data from or program data to any of the remaining sectors within
the memory. The end of a program or an erase cycle is detected by the READY/BUSY
pin, Data Polling or by the toggle bit.
The VPP pin provides data protection and faster programming. When the V
below 0.8V, the program and erase functions are inhibited. When V
above, normal program and erase operations can be performed. With V
12.0V, the program and erase operations are accelerated.
A six-byte command (Enter Single Pulse Program Mode) sequence to remove the
requirement of entering the three-byte program sequence is offered to further improve
programming time. After entering the six-byte code, only single pulses on the write con-
trol lines are required for writing into the device. This mode (Single Pulse Byte/Word
Program) is exited by powering down the device, or by pulsing the RESET pin low for a
minimum of 500 ns and then bringing it back to V
and Program Suspend/Resume commands will not work while in this mode; if entered
they will result in data being programmed into the device. It is not recommended that the
six-byte code reside in the software of the final product but only exist in external pro-
gramming code.
CC
. Erase, Erase Suspend/Resume
PP
is at 1.65V or
PP
PP
at 5.0V or
1682A–10/01
input is