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HT45F3W Datasheet(PDF) 150 Page - Holtek Semiconductor Inc

Part # HT45F3W
Description  HT45F3W
PDF  167 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F3W Datasheet(HTML) 150 Page - Holtek Semiconductor Inc

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Rev. 1.50
150
De�e��e� 01� �01�
Rev. 1.50
151
De�e��e� 01� �01�
HT45F3W
R-Type Blood Pressure Meter Flash MCU
HT45F3W
R-Type Blood Pressure Meter Flash MCU
VDDSPI Pin Function
AstheSPIinterfacesconnecttoexternaldevices,theVDDSPIpincanbeconnectedtothepower
supplyofexternaldevicestoensurethecorrectI/Ovoltagelevelinterfacing.AstheVDDSPIpinis
pin-sharedwithotherfunctions,itmustbeenabledasaVDDSPIpinusingabitintheVDDSPICR
register.TheSPIinterfacescanalsousethedeviceVDDorVOREGastheirpowersupply,the
choiceofwhichisimplementedusingbitsintheVDDSPICRregister.
VDDSPICR Register
Bit
7
6
5
4
3
2
1
0
Na�e VDDSPIC — VDDSCK1 VDDSCK0 VDDSPI11 VDDSPI10 VDDSPI01 VDDSPI00
R/W
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
—
0
0
0
0
0
0
Bit7
VDDSPIC:SelectVDDSPIorPA7
0:I/O
1:VDDSPI
Bit6
Unimplemented,readas“0”
Bit5~4
VDDSCK1, VDDSCK0:INT1andSCKOpowersupplyselect
00:VDD
01:VOREG
10:VDD
11:VDDSPIpin
UsersmustsettheVDDSPICbitto“1”whenchoosingtheVDDSPIpin.
Bit3~2
VDDSPI11, VDDSPI10:SPI1powersupplyselect
00:VDD
01:VOREG
10:VDD
11:VDDSPI
UsersmustsettheVDDSPICbitto“1”whenchoosingtheVDDSPIpin.
Bit1~0
VDDSPI01, VDDSPI00:SPI0powersupplyselect
00:VDD
01:VOREG
10:VDD
11:VDDSPI
UsersmustsettheVDDSPICbitto“1”whenchoosingtheVDDSPIpin.



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