Fujitsu MB90460 Series, Руководство по оборудованию, Страница: 228 / 739

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CHAPTER 10 TIME-BASE TIMER
10.3 Time-base Timer Control Register (TBTC)
The time-base timer control register (TBTC) selects the interval, clears the counter,
controls interrupts, and checks the status.
■
Time-base Timer Control Register (TBTC)
Figure 10.3-1 Time-base Timer Control Register (TBTC)
Addre ss
0000A9
H
Initi a l v a l u e
1XX00100
B
RE S V TBIE TBOF TBR TBC1 TBC0
TBC1
TBR
TBOF
TBIE
RE S V
Time- bas e timer initi a liz a tion b it
Re s erved b it
Interr u pt re qu e s t en ab le b it
Interr u pt re qu e s t fl a g b it
D u ring re a ding D u ring writing
D u ring re a ding D u ring writing
0
0 -
0 2
12
/HCLK (Approx. 1.0 m s )
2
14
/HCLK (Approx. 4.1 m s )
Cle a ring of the time- bas e timer
co u nter a nd TBOF b it
No ch a nge, no effect on other b it s . The re a d v a l u e i s a lw a y s "1".
Interr u pt re qu e s t o u tp u t di sab led
Interr u pt re qu e s t o u tp u t en ab led
Cle a ring of thi s b it
No overflow from the
s pecified b it
No ch a nge, no effect on other b it s .
Overflow from the s pecified
b it
Alw a y s write "1" to thi s b it.
V a l u e s in p a renthe s e s a re for a 4 MHz o s cill a tion clock.
2
16
/HCLK (Approx. 16.4 m s )
2
19
/HCLK (Approx. 1 3 1 m s )
0 1
1
1
0
0
1
1
0
1 1
TBC0 Interv a l s election b it
(WDTC) - -
15 b it
R/W R/W R/W W R/W R/W
14 1 3 12 11 10 9 8 7
0
R/W: Re a d/write
W: Write only
- : Not
us ed
x : Undefined
Initi
a l v a l u e