MB90800 Datasheet, PDF (54/88 Pages) Fujitsu Component Limited. – 16-bit Proprietary Microcontroller CMOS

MB90800 Series
13. Time-base timer
The time-base timer has a function that enables a selection of four interval times using 18-bit free-run counter
(time-base counter) with synchronizing to the internal count clock (two division of original oscillation). Further-
more, the function of timer output of oscillation stabilization wait or function supplying operation clocks for
watchdog timer are provided.
(1) Register list
Timer base timer control register (TBTC)
15
14
0000A9H _{Reserved }
13
12

TBIE
(R/W)
(1)
()
()
()
()
(R/W)
(0)
11
TBOF
(R/W)
(0)
10
TBR
(W)
(1)
9
TBC1
(R/W)
(0)
8
TBC0
(R/W)
(0)
(2) Block diagram
To PPG timer
Time-base timer counter
To watchdog timer
Dividing HCLK by 2 _{× 21 × 22}
× 2⁸ × 2⁹ × 2¹⁰ × 2¹¹ × 2¹² × 2¹³ × 2¹⁴ × 2¹⁵ × 2¹⁶ × 2¹⁷ × 2¹⁸
Power-on reset
Stop mode start
Hold status start
CKSCR : MCS = 0*¹
CKSCR : SCS = 0→1*²
Counter
clear
control
circuit
OF
OF
OF
OF
To clock controller
Oscillation stabilizing
Wait time selector
Interval timer selector
TBOF set
TBOF clear
Time-base timer control register (TBTC) _{RESV   TBIE TBOF TBR TBC1 TBC0}
Time-base timer interrupt signal
 : Unused
OF : Overflow
HCLK : Oscillation clock
*1 : The machine clock is switched from main/sub clock to PLL clock.
*2 : The machine clock is switched from sub clock to main clock.
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