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| 型號(hào)： | MB91V301CR-ESE1 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 68 MHz, RISC MICROCONTROLLER, CPGA179 |
| 封裝： | CERAMIC, PGA-179 |
| 文件頁(yè)數(shù)： | 62/139頁(yè) |
| 文件大?。?/td> | 1482K |
| 代理商： | MB91V301CR-ESE1 |
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MB91301 Series
29
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
Set the I-flag and the ILM and ICR registers to branch to an interrupt handler when the interrupt handler
triggers the microcontroller to return from the standby mode.
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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