25CS160T-ESLASHMS datasheet(32/53 Pages) MICROCHIP

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Preliminary

DS20007008B-page 32

25CS160

10.2.2

WRITING THE UNDERVOLTAGE

LOCKOUT DETECTOR REGISTER

Writing to the UVLO register can be done by using the

WUVL instruction. However, before a WUVL instruction

can be initiated, a WREN instruction must be executed

to set the WEL bit to logic ‘1’ (see Section 8.1.1 “Byte

Write”). The WUVL instruction is prevented if

WPEN = 1 and WP is asserted. Upon completion of a

WREN sequence, a WUVL instruction can be executed.

This begins by driving the CS pin low, followed by

sending in an 11h opcode on the SI pin. Then continue

by sending the desired 8-bit UVLO register value.

Note that bits 7 through bit 6 have no function, as

shown in Register 10-1. The 25CS160 will only

respond to a RDSR instruction after a WUVL sequence

until the self-timed internal write cycle has completed,

as the UVLO is a nonvolatile register. When the write

cycle is completed, the WEL bit in the STATUS regis-

ter is reset to logic ‘0’. The WUVL sequence is depicted

in Figure 10-2.

FIGURE 10-2:

WRITE UNDERVOLTAGE LOCKOUT REGISTER (

WUVL) SEQUENCE

Note:

If the CS pin is deasserted before the end

of the 16-bit sequence, the sequence will

be aborted, and no write cycle will take

place.

Note 1: This sequence initiates a self-timed internal write cycle on the rising edge of CS after a valid sequence.

1213

1415

High-Impedance

SCK

WUVL Opcode (11h)

MSb

UVLO Register Data In

UVLOEN VUVL[4:0] Level Bits

TWC(1)

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