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| 型号： | EM6640SO18A |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| 中文描述： | 微控制器 |
| 文件页数： | 28/62页 |
| 文件大小： | 620K |
| 代理商： | EM6640SO18A |
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EM6640
03/02 REV. C/446
Copyright
2002, EM Microelectronic-Marin SA
34
www.emmicroelectronic.com
8.3 SWB registers
Table 8.3.1 SWB clock selection register RegSWBCntl
Bit
Name
Reset
R/W
Description
3
EnSWB
0
R/W
enable SWB
2--
1
SWBFSel1
0
R/W
SWB clock selection
0
SWBFSel0
0
R/W
SWB clock selection
Table 8.3.2 Serial Write Buffer clock selection
SWB clock output
SWBFSel1
SWBFSel0
9375 Hz/CkExt
0
2344 Hz
0
1
75000 Hz
1
0
150000 Hz
1
For the first selection, 9375 Hz is dedicated to interactive mode and CkExt to automatic mode.
Table 8.3.3 SWB external clock and discard clock selection in register RegSWBCntl2
Bit
Name
Reset
R/W
Description
3
CkExtDiv[1]
0
R/W
SWB external clock divider selection
2
CkExtDiv[0]
0
R/W
SWB external clock divider selection
1
DiscCk[1]
0
R/W
SWB discard clock selection
0
DiscCk[0]
0
R/W
SWB discard clock selection
Table 8.3.4 Serial Write Buffer discard clock selection
Number of clocks during the last nibble
DiscCk[1]
DiscCk[0]
4 clocks
0
3 clocks
0
1
2 clocks
1
0
1clock
1
Table 8.3.5 Serial Write Buffer external clock divider selection
SWB clock output
CkExtDiv[1]
CkExtDiv[0]
external clock / 1
0
external clock / 4
0
1
external clock / 88
1
0
external clock / 352
1
Table 8.3.6 SWB buffer register RegSWBuff
Bit
Name
Reset
R/W
Description
3
Buff[3]
1
R/W
SWB buffer bit 3
2
Buff[2]
1
R/W
SWB buffer bit 2
1
Buff[1]
1
R/W
SWB buffer bit 1
0
Buff[0]
1
R/W
SWB buffer bit 0
Table 8.3.7 SWB Low size register RegSWBSizeL
Bit
Name
Reset
R/W
Description
3
Size[3]
0
R/W
auto mode buffer size bit3
2
Size[2]
0
R/W
auto mode buffer size bit2
1
Size[1]
0
R/W
auto mode buffer size bit1
0
Size[0]
0
R/W
auto mode buffer size bit0
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