ST95P04 datasheet(12/16 Pages) STMICROELECTRONICS

12 / 16 page

POWER ON STATE

After a Power up the ST95P04 is in the following

state:

– The device is in the low power standby state.

– The chip is deselected.

– The chip is not in hold condition.

– The write enable latch is reset.

– BP1 and BP0 are unchanged (non-volatile

bits).

DATA PROTECTION AND PROTOCOL SAFETY

– All inputs are protected against noise, see Ta-

ble 3.

– Non valid S and HOLD transitions are not

taken into account.

– S must come high at the proper clock count in

order to start a non-volatile write cycle (in the

memory array or in the cycle status register).

The Chip Select S must rise during the clock

pulse following the introduction of a multiple of

8 bits.

– Access to the memory array during non-vola-

tile programming cycle is cancelled and the

chip is automatically deselected; however, the

programming cycle continues.

– After either of the following operations

(WREN, WRDI, RDSR) is completed, the chip

enters a wait state and waits for a deselect.

– The write enable latch is reset upon power-up.

– The write enable latch is reset when W is

brought low.

INITIAL DELIVERY STATE

The device is delivered with the memory array in a

fully erased state (all data set at all "1’s" or FFh).

The block protect bits are initialized to 00.

AI01434

3456789 10 11 12 13 14 15

HIGH IMPEDANCE

INSTRUCTION

STATUS REG.

Figure 13. WRSR: Write Status Register Sequence

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ST95P04

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