25CS160-ISLASHST datasheet(29/53 Pages) MICROCHIP

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Preliminary

DS20007008B-page 29

25CS160

9.2.2

DETERMINING THE LOCK STATE

OF THE SECURITY REGISTER

To determine whether or not the user-programmable,

lockable ID page of the Security register is locked, the

25CS160 includes a CHLK instruction. To determine the

lock status, the opcode 83h must be clocked into the

device on the SI line. The address bit A10 must be

equal to logic ‘1’, while the other address bits are “don’t

care”. Data bit 0 of the data byte clocked out on the SO

line determines the lock state; the other bits of the data

byte are “don’t care” bits. A data response of

xxxxxxx1b indicates the region is locked, while a

xxxxxxx0b response indicates that the region is not

locked.

FIGURE 9-5:

CHECK SECURITY REGISTER LOCK (

CHLK) SEQUENCE

10 0 0 00 11

A A A

RDEX Opcode (83h)

XX XX X 1

Data Out

MSb

High-Impedance

Note 1:

A15 through A0 are “don't care” bits, except for A10, which must be a logic ‘1’.

D5 D4 D3 D2 D1 D0

SCK

234

567

9 10 11 12

Address Bits A15-A0(1)

10 0 0 00 11

A A A

XX XX X

High-Impedance

D5 D4 D3 D2 D1 D0

Address Bits A15-A0(1)

xxxxxxx1b = Locked

xxxxxxx0b = Unlocked

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