MB91301 datasheet(25/135 Pages) FUJI

25 / 135 page

MB91301 Series

• I-bus memory

Do not set a stack area or vector table in I-bus memory.

It may cause a hang during EIT processing (including RETI).

Recovery from the hang requires a reset.

Do not perform DMA transfer to I-bus memory.

• Low-power consumption modes

• To enter the standby mode, use the synchronous standby mode (set with the SYNCS bit as bit 8 in the

TBCR, or time-base counter control register) and be sure to use the following sequence:

(LDI

#value_of_standby, R0)

(LDI

#_STCR, R12)

STB

R0, @R12

; Write to standby control register (STCR)

LDUB

@R12, R0

; Read STCR for synchronous standby

LDUB

@R12, R0

; Read STCR again for dummy read

NOP

; NOP x 5 for timing adjustment

NOP

• If you use the monitor debugger, follow the precautions below:

Do not set a breakpoint within the above array of instructions.

Do not single-step the above array of instructions.

• Prefetch

When accessing a prefetch-enabled little endian area, use word access only (access in 32 bits).

Byte or halfword access results in wrong data read.

• MCLK and SYSCLK

MCLK causes a stop in SLEEP/STOP mode while SYSCLK causes a stop only in STOP mode. Use either

depending on each application.

• Pull-up control

When function pins listed in the AC specifications (such as external bus control pins) have pull-up control,

enabling the pull-up resistor for a pin causes the actual pin load conditions to change. As all AC specifications

for this device were measured under the condition of pull-up resistors disabled, the values are not guaranteed

of AC specifications when pull-up resistors are enabled.

Even if the pull-up resistor is set to enabled for a pin, if the HIZ bit in the standby control register (STCR) specifies

setting output pins to high impedance during stop mode (HIZ

= 1) , changing to stop mode (STOP = 1) causes

the pull-up resistor to be disabled.

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