MB91F522DKBPMC datasheet(46/280 Pages) CYPRESS

Part #	MB91F522DKBPMC

Description	32-bit FR81S Microcontroller

PDF	280 Pages

Scroll/Zoom	100%

Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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46 / 280 page

Document Number: 002-04662 Rev. *F

Page 46 of 280

MB91520 Series

 Notes When Writing Data in a Register Having the Status Flag

When writing data in the register that has a status flag (especially, an interrupt request flag) to control function, taking care not to

clear its status flag erroneously must be followed.

The program must be written not to clear the flag to the status bit, and then to set the control bits to have the desired value.

Especially, if multiple control bits are used, the bit instruction cannot be used. (The bit instruction can access to a single bit only.)

By the Byte, Half-word, or Word access, data is written to the control bits and status flag simultaneously. During this time, take

care not to clear other bits (in this case, the bits of status flag) erroneously.

Note: These points can be ignored because the bit instructions are already taken the points into consideration.

MB91F522DKBPMC Datasheet(PDF) 46 Page - Cypress Semiconductor