m35b32 STMicroelectronics, m35b32 Datasheet - Page 12

• Manufacturer Part Number: m35b32
• Description: 32 Kbit, 256-byte Page, Fast Program Eeprom Memory Accessed By Spi Bus Interface
• Manufacturer: STMicroelectronics

Operating features
4
4.1
4.2
4.3
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Operating features
An easy way to modify data
The Page Write (PW) instruction provides a convenient way of modifying data (1 up to 256
contiguous bytes at a time), and simply requires the start address, and the new data in the
instruction sequence.
A fast way to store data
The Page Program (PP) instruction provides a fast way of modifying the data (1 up to 256
contiguous bytes at a time) in the Event sector, provided that these data bytes were erased
(by the completion of an earlier Page Erase instruction).
When addressing the Event sector (Sector 0, see
executed in a very short time (t
executing a Page Program (or Page Write) instruction in the Data sector.
To be correctly used, the Event sector has to be first erased. When an event occurs, data
are programmed in the Event sector within a fast time. Later on, when the device receives
less requests from the application, the contents of the Event sector can be copied/written
into the Data sector (to benefit from the standard data retention time of 40 years), after what
the Event sector content can be erased (using only one instruction: the Sector Erase
instruction).
Polling during a write, program or erase cycle
A further improvement in the write, program or erase time can be achieved by not waiting for
the worst case delay (t
Status Register so that the application program can monitor its value, polling it to establish
when the previous cycle is complete.
PW
, t
PP
, t
Doc ID 18391 Rev 3
FP
PE
, see
, or t
SE
Table
). The write in progress (WIP) bit is provided in the
11), that is about 5 times faster than when
Figure
5), the Page Program instruction is
M35B32