Fujitsu FR81S User Manual
CHAPTER 7: RESET
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER :
RESET
FUJITSU SEMICONDUCTOR CONFIDENTIAL
39
5.5. Reset Sequence
The reset sequence is shown.
This product transits from the initial state to start running the programs and hardware by disappearance of reset
factors. A series of operations from this reset to the start of operation is called a reset sequence. This section
explains the reset sequence.
Figure 5-5
Reset Sequence
Notes:
-If (i) occurs after (vii) or during (v) or (vi), the sequence restarts from (i).
-If (i) occurs after (B), the sequence restarts from (i).
-If (i) occurs after (B), the sequence restarts from (i).
Refer to "Figure 2-1 Diagram of Device State Transitions" in CHAPTER of "CLOCK RESET STATE TRANSITIONS" for details.
-The main clock oscillation stabilization wait time is taken during (iv).
-The main clock oscillation stabilization wait time is taken during (vii), (viii), or (ix) if necessary (CMONR:MCRDY=0).
-Refer to CHAPTER of "FIXEDVECTOR FUNCTION" for details on (x).
-At illegal standby mode transition detection reset, the status is a bus idle status after generating reset source, so the status move to (ix).
-Super initialize reset (SINIT) is issued at the recovery from standby (power shutdown) (A). However, because of preventing a reset to
-The main clock oscillation stabilization wait time is taken during (vii), (viii), or (ix) if necessary (CMONR:MCRDY=0).
-Refer to CHAPTER of "FIXEDVECTOR FUNCTION" for details on (x).
-At illegal standby mode transition detection reset, the status is a bus idle status after generating reset source, so the status move to (ix).
-Super initialize reset (SINIT) is issued at the recovery from standby (power shutdown) (A). However, because of preventing a reset to
following block,the reset without SINIT to this block will be masked (B) during the reset period.
(1) RTC (only watch mode)
(2) External interrupt block
(3) Power management unit
(4) Clock generation block (only sub-clock selection register)
(2) External interrupt block
(3) Power management unit
(4) Clock generation block (only sub-clock selection register)
Generate reset source (i)
Power-on reset
Internal low-voltage detection reset
External reset + NMIX assert
Generate reset source (ii)
Watchdog reset 1 (HW)
Watchdog reset 0 (SW)
Generate reset source (iii)
External reset
External low-voltage detection reset
Illegal standby mode transition detection reset
Software reset
Flash security violation reset
Generate reset source (A)
Recovery reset from standby
(power shutdown)
Mask reset (B)
Wait for bus idle
(vi)
Wait for bus idle
(v)
Issue super initialize
reset (SINIT)
(iv)
Issue initialize reset (vii)
Issue reset (viii)
(Chip reset sequence)
Transition of Bus Control
Fetch reset vector(x)
Start the program
Issue reset (ix)
Issue initialize reset (D)
Issue reset (E)
(Chip reset sequence)
Release mask of reset (F)
Reset
time out
Bus idle
Reset
time out
Bus idle
Release only asynchronous reset
Release synchronous reset
MB91520 Series
MN705-00010-1v0-E
292