MB91F577B datasheet(55/163 Pages) CYPRESS

55 / 163 page

Document Number: 002-04725 Rev.*A

Page 55 of 163

MB91570 Series

Low-power Consumption Mode

To transit to the sleep mode, watch mode, stop mode, watch mode(power-off) or stop mode(power-off), follow the procedure

explained in the "Activating the sleep mode, watch mode, or stop mode" or the "Activating the watch mode (power-off) or stop

mode(power-off)" of "POWER CONSUMPTION CONTROL" in Hardware Manual.

Take the following notes when using a monitor debugger.

Do not set a break point for the low-power consumption transition program.

Do not execute an operation step for the low-power consumption transition program.

Precautions when writing to registers including the status flag

When writing a function control data in the register that has a status flag (especially, an interrupt request flag), 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, writing data in the control bits and status flag simultaneously is done. 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 to a register which supports RMW are already taken the points into

consideration. Care must be taken when the bit instruction is used to a register which does not support RMW.

No-connected-pin

The product of LQFP-208 has some no-connected-pin which is not connected to any function on die. Pins are recommended to be

pulled-up or pulled-down on the extern circuit.

MB91F577B Datasheet(PDF) 55 Page - Cypress Semiconductor