M35B32 datasheet(28/44 Pages) STMICROELECTRONICS

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Instructions

M35B32

28/44

DocID18391 Rev 4

6.11

Sector Erase (SE)

The M35B32 offers two sectors: the Data sector and the Event sector.

The Sector Erase (SE) instruction sets to 1 (FFh) all bits inside the chosen sector:

•

when the transmitted address is inside the Event sector, the data in the Event sector

are erased if the W pin is driven high

•

when the transmitted address is inside the Data sector, the data in the top pages are

erased (whatever the state of the W pin)

•

when the transmitted address is above 1000h: no action

Before it can be accepted, a Write Enable (WREN) instruction must previously have been

executed.

After the Write Enable, the Sector Erase (SE) instruction is entered by driving Chip Select

(S) low, followed by the instruction code, and two address bytes on Serial Data Input (D).

Any address inside the Sector is a valid address for the Sector Erase (SE) instruction. Chip

Select (S) must be driven low for the entire duration of the sequence.

The instruction sequence is shown in Figure 16.

Chip Select (S) must be driven high after the eighth bit of the last address byte has been

latched in, otherwise the Sector Erase (SE) instruction is not executed. As soon as Chip

Select (S) is driven high, the self-timed Sector Erase cycle (whose duration is tSE) is

initiated. While the Sector Erase cycle is in progress, the Status Register may be read to

check the value of the Write In Progress (WIP) bit. The Write In Progress (WIP) bit is at 1

during the self-timed Sector Erase cycle, and it is at 0 when the cycle is complete. The Write

Enable Latch (WEL) bit is also reset (or not) once the self-timed Sector Erase cycle is

complete, depending on the logical level applied on the W input pin and the value of the

decoded address, as shown in Table 4.

A Sector Erase (SE) instruction applied to a sector that contains a page that is Hardware

Protected is not executed.

Any Sector Erase (SE) instruction, while an Erase, Program or Write cycle is in progress, is

rejected without having any effects on the cycle that is in progress.

Figure 16. Sector Erase (SE) instruction sequence

1. Address bits A15 to A12 are Don’t Care.

16-bit address

AI15476

3456789

29 30 31

Instruction

15 14

MSB

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