Reset Factors And Oscillation Stabilization Wait Times - Fujitsu MB90335 Series Hardware Manual

CHAPTER 4 RESET

4.2 Reset Factors and Oscillation Stabilization Wait Times

4.2 Reset Factors and Oscillation Stabilization Wait Times
There are four kinds of reset factors of MB90335 series. The oscillation stabilization
wait time varies with the reset cause.
■ Reset Factors and Oscillation Stabilization Wait Times
Table 4.2-1 shows the relationship between the reset causes and the oscillation stabilization wait time.
Table 4.2-1 Reset Factors and Oscillation Stabilization Wait Times
Reset factor
Power on reset
Watchdog timer
External reset from RST pin
Software reset
HCLK: Oscillation clock
WS1, WS0: Bits used to select the oscillation stabilization wait time of the clock selection register (CKSCR).
Figure 4.2-1 shows the oscillation stabilization wait times for the evaluation/flash and MASK products
during power on reset time.
114
Oscillation stabilization wait time
Each value in parentheses ( ) represents the period for the oscillation clock
at 6 MHz.
Evaluation products/flash products/MASK product: 2
None: However, WS1 and WS0 bit are initialized by "11
None: However, WS1 and WS0 bit are initialized by "11
None: However, WS1 and WS0 bit are initialized by "11
FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
17
/HCLK (about 21.85 ms).
".
B
".
B
".
B
CM44-10137-6E