581
A.2.17
Timer Status Registers 0–4 (TSR0–TSR4)
ITU
•
Start Address: H'5FFFF07 (channel 0), H'5FFFF11 (channel 1), H'5FFFF1B (channel 2),
H'5FFFF25 (channel 3), H'5FFFF35 (channel 4),
•
Bus Width: 8
Register Overview:
Bit:
7
6
5
4
32
1
0
Bit name:
—
—
—
—
—
OVF
IMFB
IMFA
Initial value:
*
1
1
1
1
1
0
0
0
R/W:
—
—
—
—
—
R/(W)
*
2
R/(W)
*
2
R/(W)
*
2
Notes:
*
1 Undetermined
*
2 Only 0 can be written, to clear the flag.
Table A.18 TSR0–TSR4 Bit Functions
Bit
Bit name
Value
Description
2
Overflow flag (OVF)
0
Clear conditions: 0 is written in OVF after
reading OVF = 1
(Initial value)
1
Set conditions: TCNT value overflows (H'FFFF
→
H'0000) or underflows (H'FFFF
→
H'0000)
1
Input capture/compare match
flag B (IMFB)
0
Clear conditions: 0 is written in IMFB after
reading IMFB = 1
(Initial value)
1
Set conditions: (1) When GRB is functioning as
the output compare register, and TCNT = GRB;
(2) When GRB is functioning as the input
capture register, and the TCNT value is
transferred to GRB by the input capture signal
0
Input capture/compare match
flag A (IMFA)
0
Clear conditions: 0 is written in IMFA after
reading IMFA = 1
(Initial value)
1
Set conditions: (1) When GRA is functioning as
the output compare register, and TCNT = GRA;
(2) When GRA is functioning as the input
capture register, and the TCNT value is
transferred to GRA by the input capture signal
Содержание HD6417032
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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