Fujitsu FR81S User Manual
CHAPTER 13: EXTERNAL INTERRUPT INPUT
8. Notes
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : EXTERNAL INTERRUPT INPUT
FUJITSU SEMICONDUCTOR CONFIDENTIAL
14
8. Notes
This section explains the notes of the external interrupt input.
The external interrupt input register is not initialized when returned from the standby clock mode (power
shutdown) and the standby stop mode (power shutdown) when PMUCTLR:IOCTMD=1. To maintain the
status before it returns and the status under return, set the device in the status of the I/O maintenance by
setting PMUCTLR:IOCTMD before setting standby. And, release the I/O maintenance by setting
PMUCTLR:IOCT after the I/O port is set. See "CHAPTER: POWER CONSUMPTION CONTROL" for
the details of the PMUCTLR register.
Moreover, the internal reset is issued at the return from the standby watch mode (power shutdown) and the
standby stop mode (power shutdown) when PMUCTLR:IOCTMD=1. Therefore, only the reset factors
(power-on reset, internal low-voltage detection, and simultaneous assert of RSTX and NMIX) are accepted.
At this time, the register of the external interrupt input is not initialized. If the reset input from RSTX pin
input or the external low voltage detection flag is set after the start-up, initialize the external interrupt input
register before using.
MB91520 Series
MN705-00010-1v0-E
487