Fujitsu FR81S User Manual
CHAPTER 30: POWER CONSUMPTION CONTROL
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : POWER CONSUMPTION CONTROL
FUJITSU SEMICONDUCTOR CONFIDENTIAL
36
5.5.3. Wake Up from the Watch Mode with power-shutdown
Wake up from the watch mode with power-shutdown is described below.
The watch mode with power-shutdown is terminated under the following conditions:
⋅
Reset
⋅
Generation of external interrupt request
⋅
Generation of NMI request
⋅
Generation of RTC interrupt request
⋅
Generation of main/sub timer interrupt request
For the wake up caused by an interrupt request, the CPU and the interrupt controller do not necessarily have
to be set so as to accept this interrupt request. The CPU always starts operation from the reset state.
The register of RTC and external interrupt input (IOCTMD=1) is not initialized.
Only the reset factors (power-on reset, internal low-voltage reset, and simultaneous assert of RSTX and
NMIX) are accepted during wake-up. At this time, the register of the RTC and external interrupt input
(IOCTMD=1) is not initialized. If the reset input from RSTX pin input or the external low-voltage detection
flag are set after the start-up, initialize the RTC/external interrupt input register before using.
MB91520 Series
MN705-00010-1v0-E
1123