MCP795W21 datasheet(35/54 Pages) MICROCHIP

部件名	MCP795W21

功能描述	3V SPI Real-Time Clock Calendar with Enhanced Features and Battery Switchover

PDF	54 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

35 / 54 page

 2011-2012 Microchip Technology Inc.

Preliminary

DS22280C-page 35

MCP795W1X/MCP795W2X

9.1.9

WRITE STATUS REGISTER

(SRWRITE)

The Write Status Register (SRWRITE) instruction

allows the user to select one of four levels of protec-

tion for the array by writing to the appropriate bits in

the STATUS register. The array is divided up into four

segments. The user has the ability to write-protect

none, one, two, or all four of the segments of the array.

The partitioning is controlled as shown in Table 9-2.

See Figure 9-6 for the SRWRITE timing sequence.

TABLE 9-2:

ARRAY PROTECTION

FIGURE 9-6:

WRITE STATUS REGISTER TIMING SEQUENCE

BP1

BP0

Array Addresses

Write-Protected

(2 kbit shown)

none

upper 1/4

(C0h-FFh)

upper 1/2

(80h-FFh)

all

(00h-FFh)

1011

131415

Instruction

Data to STATUS Register

High-Impedance

SCK

23456

TWC

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