MB91F583ASH datasheet(37/176 Pages) CYPRESS

37 / 176 page

Document Number: 002-04665 Rev *A

Page 36 of 175

MB91580M/S Series

 Power-on sequence of A/D converter power supply analog inputs

Be sure to turn on the digital power supply (VCC5) first, and then turn on the A/D converter power supplies (AVCC0,

AVCC1, AVRH0, AVRH1, AVRL0, AVRL1) and analog inputs (AN0 to AN14, AN16 to AN23). Also, turn off the A/D

converter power supplies (AVCC0, AVCC1, AVRH0, AVRH1, AVRL0, AVRL1) and analog inputs (AN0 to AN14, AN16

to AN23) first, and then turn off the digital power supply (VCC5). When the AVRH0 and AVRH1 pin voltages are turned

on or off, they must not exceed AVCC0 and AVCC1. Even if a common analog input pin is used as an input port, its

input voltage must not exceed AVCC0 or AVCC1. (However, the analog power supply voltage and digital power supply

voltage can be turned on or off simultaneously.)

 Treatment of C pin

This device contains a voltage step-down circuit. A capacitor must always be connected to the C pin to assure the

internal stabilization of the device. For the standard values, see the "Recommended Operating Conditions" of the

latest data sheet.

 Function Switching of a Multiplexed Port

To switch between the port function and the multiplexed pin function, use the PFR (port function register). For details,

see "I/O PORTS" in Hardware Manual.

 Low-power Consumption Mode

To set Sleep mode / Watch mode / Stop mode, or Watch mode (power-off) / Stop mode (power-off), see the section

"Launching Sleep mode / Watch mode / Stop mode" or "Launching Watch mode (power-off) / Stop mode (power-off)"

of "POWER CONSUMPTION CONTROL" in Hardware Manual, and follow the procedures.

Do not perform the following 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.

 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, take

care not to clear its status flag erroneously.

The program must be written not to clear the flag to the status bit, and 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.) The Byte, Half-word, or Word access must be used to write data in 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 already take the points into consideration for

registers that support read-modify-write (RMW) operations. These points must be considered when using the bit

instructions for registers that do not support RMW operations.

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