參數(shù)資料
型號: μPD789197
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 90/146頁
文件大?。?/td> 630K
代理商: ΜPD789197
Preliminary Product Information
90
μ
PD789186, 789187, 789196, 789197
(e) SMB input level setting register 0 (SMBVI0)
SMBVI0 is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears SMBVI0 to 00H.
Figure 6-42. Format of SMB Input Level Setting Register 0
TOS02
0
TOS02
TOS01
TOS00
SVIN0
0
LVL01
LVL00
SMBVI0
Symbol
Address
When 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
1024/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
TX
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)
1024/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)
1024/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)
1024/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 setting bits
Note
Set an input level from 0.75 to 1.25 V.
Caution
Bits 2 and 7 must be fixed to 0.
Remarks 1.
f
X
: Main system clock frequency
2.
f
XT
: Subsystem clock frequency
3.
f
TO
: Clock selected using bits 0 and 1 (TOCL00, TOCL01) of SMB mode register 0 (SMBM0).
4.
The parenthesized values apply to operation at f
X
= 5.0 MHz.
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