MB90335 Datasheet, PDF (28/84 Pages) Fuji Electric – 16-bit Proprietary Microcontroller

MB90335 Series
2. Time-base timer
• The time-base timer is an 18-bit free-running counter (time-base timer counter) that counts in synchronization
with the main clock (2 cycles of the oscillation clock HCLK).
• Four different time intervals can be selected, for each of which an interrupt request can be generated.
• Operating clock signals are supplied to peripheral resources such as the oscillation stabilization wait timer and
watchdog timer.
• Interval time of time-base timer
Internal count clock cycle
2/HCLK (0.33 µs)
Interval time
2¹²/HCLK (Approx. 0.68 ms)
2¹⁴/HCLK (Approx. 2.7 ms)
2¹⁶/HCLK (Approx. 10.9 ms)
2¹⁹/HCLK (Approx. 87.4 ms)
Notes : • HCLK : Oscillation clock frequency
• The parenthesized values assume an oscillator clock frequency of 6 MHz.
• Clock cycles supplied from time-base timer
Where to supply clock
Clock cycle
Oscillation stabilization wait of
main clock
2¹³/HCLK (Approx. 1.36 ms)
2¹⁵/HCLK (Approx. 5.46 ms)
2¹⁷/HCLK (Approx. 21.84 ms)
2¹²/HCLK (Approx. 0.68 ms)
Watch dog timer
2¹⁴/HCLK (Approx. 2.7 ms)
2¹⁶/HCLK (Approx. 10.9 ms)
2¹⁹/HCLK (Approx. 87.4 ms)
Notes : • HCLK : Oscillation clock frequency
• The parenthesized values assume an oscillator clock frequency of 6 MHz.
• Register list
Time-base timer control register (TBTC)
15
14
Address : 0000A9H _{RESV }
13
12
11
10
9
8

TBIE TBOF TBR TBC1 TBC0
( R/W ) (  ) (  ) ( R/W ) ( R/W ) ( W ) ( R/W ) ( R/W )
Initial Value
1--00100B
Note : For the conditions for clearing the time-base timer, refer to the chapter for the time-base timer in the hardware
manual.
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