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HWM90480001
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Transition to standby mode
The definition of Standby Cancel Failure is that the CPU will execute wrong
instructions when an interrupt is executed during transition to Standby mode
1
at a certain time.
1
:Definition of Standby mode
Main sleep mode, PLL sleep mode, Sub-sleep mode
Time base timer mode, Watch mode, Main watch mode
Main stop mode, PLL stop mode, Sub-stop mode
*Main watch mode is only for MB90370 series.
In the following cases, no problem occurs:
-Standby mode is not used
-Standby mode is released only by external reset
For further information refer to Hardware Manual chapter: ‘Low power
consumption mode.’
HWM90480002
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CHAPTER 27 I2C INTERFACE (ONLY MB90485 SERIES)
Restriction of specification at sending General Call Address for MCU with I2C
When using Multi-Master mode for I2C and another Master is sending a General
Code Address at same time as Fujitsu MCU, an arbitration lost* occurs after
2nd byte.
Under following conditions the restriction do not exist:
- No usage of I2C peripheral
- Usage of I2C with Single Master system
- Usage of I2C with Multi Master system, no General Call Address used
- Usage of I2C with Multi Master system, General Call Address used by Fujitsu
MCU, only
- Usage of I2C with Multi Master system, General Call Address used. If the
value of data, send by Fujitsu MCU, is smaller than another transfer data, the
arbitration lost does not occur.
*: If the data value is smaller than another one, oneself never has
"Arbitration lost" because one with large transmission data value will have
"Arbitration lost".