MCP79521 datasheet(10/50 Pages) MAS

Part #	MCP79521

Description	3V SPI Real-Time Clock Calendar with Battery Switchover

PDF	50 Pages

Scroll/Zoom	100%

Manufacturer	MAS [Micro Analog systems]

Direct Link	http://www.mas-oy.com

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10 / 50 page

MCP7952X/MCP7951X

DS22300A-page 10

Preliminary

 2012 Microchip Technology Inc.

3.3

Write Enable (EEWREN) and Write

Disable (EEWRDI)

The MCP795XX contains a write enable latch.

This latch must be set before any EEWRITE,

SRWRITE and IDWRITE operation will be completed

internally. The EEWREN instruction will set the latch, and

the EEWRDI will reset the latch.

The following is a list of conditions under which the

write enable latch will be reset:

• Power-up

• EEWRDI instruction successfully executed

• SRWRITE instruction successfully executed

• EEWRITE instruction successfully executed

• IDWRITE instruction successfully executed

FIGURE 3-4:

WRITE ENABLE SEQUENCE (EEWREN)

FIGURE 3-5:

WRITE DISABLE SEQUENCE (EEWRDI)

SCK

High-Impedance

SCK

2345

High-Impedance

MCP79521 Datasheet(PDF) 10 Page - Micro Analog systems