Reset Factors And Oscillation Stabilization Wait Time - Fujitsu MB90480 Series Hardware Manual

CHAPTER 4 RESET
4.2

Reset Factors and Oscillation Stabilization Wait Time

The four types of reset factors can occur in the MB90480/485 series devices. The
oscillation stabilization wait time during a reset varies depending on the reset factor.
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Reset factors and oscillation stabilization wait time
Table 4.2-1 summarizes the reset factors and the oscillation stabilization wait time.
Table 4.2-1 Reset factors and oscillation stabilization wait time
Reset factors
Power-on reset
Watchdog timer
External reset via pin RST
Software reset
HCLK: Oscillation clock
WS1, WS0: Bits for selecting oscillation stabilization wait time of clock selection register (CKSCR)
98
Oscillation stabilization wait time
The value in parentheses ( ) is a period when oscillation clock is 4 MHz
Evaluation devices/FLASH devices: 2
17
Mask devices: 2 /HCLK (about 32.77 ms)
None: Bits WS1 and WS0 are initialized to "11
None: Bits WS1 and WS0 are initialized to "11
None: Bits WS1 and WS0 are initialized to "11
18
/HCLK (about 65.54 ms).
".
B
".
B
".
B