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MB90480 Datasheet(PDF) 67 Page - Fujitsu Component Limited.

Part No. MB90480
Description  16-bit Proprietary Microcontroller
Download  120 Pages
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Maker  FUJITSU [Fujitsu Component Limited.]
Homepage  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90480 Datasheet(HTML) 67 Page - Fujitsu Component Limited.

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MB90480/485 Series
67
15. Timebase Timer
The timebase timer is an 18-bit free run counter (timebase counter) that counts up in synchronization with the
internal count clock signal (base oscillator
× 2) , and functions as an interval timer with a choice of four types of
time intervals. Other functions provided by this module include timer output for the oscillator stabilization wait
period, and operating clock signal feed for other timer circuits such as the watchdog timer.
(1) Register List
(2) Block Diagram
Timebase timer control register (TBTC)
0000A9H
Read/write
Initial value
X
X
R/W
0
R/W
0
W
1
R/W
0
R/W
0
15
14
13
12
11
10
9
8
R/W
1
RESV
TBIE
TBOF
TBR
TBC1
TBC0
OF
OF
OF
OF
× 21 × 22
× 28 × 29 × 210 × 211 × 212 × 213 × 214 × 215 × 216 × 217 × 218
⎯⎯
RESV
TBIE TBOF TBR
TBC1 TBC0
Interval timer
selector
To PPG timer
Timebase
timer counter
HCLK
× 2
To watchdog
timer
Power-on reset
Counter
clear
control
circuit
TBOF clear
Timebase timer control register (TBTC)
Timebase timer interrupt signal
To clock control
module oscillator
stabilization wait
time selector
TBOF
set
OF
: Overflow
HCLK : Oscillator clock
*1
: Switch machine clock from main clock or sub clock to PLL clock.
*2
: Switch machine clock from sub clock to main clock.
Stop mode start
Hold status start
CKSCR : MCS
= 1→0*1
CKSCR : SCS
= 0→1*2


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