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CHAPTER 15 SMB (SYSTEM MANGEMENT BUS 0)
249
(5)
SMB input level setting register 0 (SMBVI0)
SMBVI0 is manipulated with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears SMBVI0 to 00H.
Figure 15-6. Format of SMB Input Level Setting Register 0
Note
Set an input level from 0.75 to 1.25 V.
TOS02
0
TOS02
TOS01
TOS00
SVIN0
0
LVL01
LVL00
SMBVI0
Symbol
Address
After Reset
R/W
FF7DH
00H
R/W
6
7
5
4
3
2
1
0
SVIN0
Input Level Selection Bit
Same input level as the ordinary hysteresis
0
The voltage set with LVL01 and LVL00 is used as the SCL0 and SDA0 input level threshold.
1
LVL01
LVL00
Input Level Selection Bits
Note
The input level is 0.1875
×
V
DD
.
The input level is 0.25
×
V
DD
.
The input level is 0.375
×
V
DD
.
The input level is 0.5
×
V
DD
.
0
0
1
1
0
1
0
1
TOS01
TOS00
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1,024/f
TO
(13.1 ms)
896/f
TO
(11.5 ms)
f
TO
= f
X
/2
6
f
TO
= f
X
/2
7
f
TO
= f
X
/2
8
f
TO
= f
XT
768/f
TO
(9.8 ms)
640/f
TO
(8.2 ms)
512/f
TO
(6.6 ms)
384/f
TO
(4.9 ms)
256/f
TO
(3.3 ms)
128/f
TO
(1.6 ms)
1,024/f
TO
(26.2 ms)
896/f
TO
(22.9 ms)
768/f
TO
(19.7 ms)
640/f
TO
(16.4 ms)
512/f
TO
(13.1 ms)
384/f
TO
(9.8 ms)
256/f
TO
(6.6 ms)
128/f
TO
(3.2 ms)
1,024/f
TO
(52.4 ms)
896/f
TO
(45.9 ms)
768/f
TO
(39.3 ms)
640/f
TO
(32.8 ms)
512/f
TO
(26.2 ms)
384/f
TO
(19.7 ms)
256/f
TO
(13.1 ms)
128/f
TO
(6.6 ms)
1,024/f
TO
(31.3 ms)
896/f
TO
(27.3 ms)
768/f
TO
(23.4 ms)
640/f
TO
(19.5 ms)
512/f
TO
(15.6 ms)
384/f
TO
(11.7 ms)
256/f
TO
(7.8 ms)
128/f
TO
(3.9 ms)
Time-Out Time Selection Bits (At f
X
= 5.0 MHz)
TOS02
TOS01
TOS00
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1,024/f
TO
(16.4 ms)
896/f
TO
(14.3 ms)
f
TO
= f
CC
/2
6
f
TO
= f
CC
/2
7
f
TO
= f
CC
/2
8
f
TO
= f
XT
768/f
TO
(12.3 ms)
640/f
TO
(10.2 ms)
512/f
TO
(8.19 ms)
384/f
TO
(6.14 ms)
256/f
TO
(4.10 ms)
128/f
TO
(2.05 ms)
1,024/f
TO
(32.8 ms)
896/f
TO
(28.7 ms)
768/f
TO
(24.6 ms)
640/f
TO
(20.5 ms)
512/f
TO
(16.4 ms)
384/f
TO
(12.3 ms)
256/f
TO
(8.19 ms)
128/f
TO
(4.10 ms)
1,024/f
TO
(65.5 ms)
896/f
TO
(57.3 ms)
768/f
TO
(49.2 ms)
640/f
TO
(41.0 ms)
512/f
TO
(32.8 ms)
384/f
TO
(24.6 ms)
256/f
TO
(16.4 ms)
128/f
TO
(8.19 ms)
1,024/f
TO
(31.3 ms)
896/f
TO
(27.3 ms)
768/f
TO
(23.4 ms)
640/f
TO
(19.5 ms)
512/f
TO
(15.6 ms)
384/f
TO
(11.7 ms)
256/f
TO
(7.8 ms)
128/f
TO
(3.9 ms)
Time-Out Time Selection Bits (At f
CC
= 4.0 MHz)