IXXBB1 Fujitsu Microelectronics, Inc., IXXBB1 Datasheet - Page 25
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IXXBB1
Manufacturer Part Number
IXXBB1
Description
32-bit Proprietary Microcontroller Cmos Fr60 Mb91301 Series
Manufacturer
Fujitsu Microelectronics, Inc.
Datasheet
1.IXXBB1.pdf
(135 pages)
- Current page: 25 of 135
- Download datasheet (2Mb)
I-bus memory
Low-power consumption modes
Prefetch
MCLK and SYSCLK
Pull-up control
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.
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 causes a stop in SLEEP/STOP mode while SYSCLK causes a stop only in STOP mode. Use either
depending on each application.
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
the pull-up resistor to be disabled.
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:
If you use the monitor debugger, follow the precautions below:
(LDI
STB
(LDI
LDUB
LDUB
NOP
NOP
NOP
NOP
NOP
Do not set a breakpoint within the above array of instructions.
Do not single-step the above array of instructions.
#value_of_standby, R0)
#_STCR, R12)
R0, @R12
@R12, R0
@R12, R0
; Write to standby control register (STCR)
; Read STCR for synchronous standby
; Read STCR again for dummy read
; NOP x 5 for timing adjustment
1) , changing to stop mode (STOP
MB91301 Series
1) causes
25
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