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HT45F75 Datasheet(PDF) 114 Page - Holtek Semiconductor Inc

Part # HT45F75
Description  Body Fat Scale Flash MCU
PDF  190 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 114 Page - Holtek Semiconductor Inc

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Rev. 1.10
11�
De�e��e� 1�� �01�
Rev. 1.10
115
De�e��e� 1�� �01�
HT45F75
Body Fat Scale Flash MCU
HT45F75
Body Fat Scale Flash MCU
SPI Registers
TherearethreeinternalregisterswhichcontroltheoveralloperationoftheSPIinterface.Theseare
theSIMDdataregisterandtworegistersSIMC0andSIMC2.NotethattheSIMC1registerisonly
usedbytheI2Cinterface.
Register
Name
Bit
7
6
5
4
3
2
1
0
SIMC0
SIM�
SIM1
SIM0
—
SIMDBC1 SIMDBC0
SIMEN
SIMICF
SIMD
D7
D�
D5
D�
D3
D�
D1
D0
SIMC�
D7
D�
CKPOLB
CKEG
MLS
CSEN
WCOL
TRF
SIM Registers List
TheSIMDregisterisusedtostorethedatabeingtransmittedandreceived.Thesameregisterisused
byboththeSPIandI2Cfunctions.BeforethedevicewritesdatatotheSPIbus,theactualdatato
betransmittedmustbeplacedintheSIMDregister.AfterthedataisreceivedfromtheSPIbus,the
devicecanreaditfromtheSIMDregister.AnytransmissionorreceptionofdatafromtheSPIbus
mustbemadeviatheSIMDregister.
SIMD Register
Bit
7
6
5
4
3
2
1
0
Na�e
D7
D�
D5
D�
D3
D�
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
x
x
x
x
x
x
x
x
“x” unknown
TherearealsotwocontrolregistersfortheSPIinterface,SIMC0andSIMC2.NotethattheSIMC2
registeralsohasthenameSIMAwhichisusedbytheI2Cfunction.TheSIMC1registerisnotused
bytheSPIfunction,onlybytheI2Cfunction.RegisterSIMC0isusedtocontroltheenable/disable
functionandtosetthedatatransmissionclockfrequency.AlthoughnotconnectedwiththeSPI
function,theSIMC0registerisalsousedtocontrolthePeripheralClockPrescaler.RegisterSIMC2
isusedforothercontrolfunctionssuchasLSB/MSBselection,writecollisionflagetc.
SIMC0 Register
Bit
7
6
5
4
3
2
1
0
Na�e
SIM�
SIM1
SIM0
—
SIMDBC1 SIMDBC0
SIMEN
SIMICF
R/W
R/W
R/W
R/W
—
R/W
R/W
R/W
R/W
POR
1
1
1
—
0
0
0
0
Bit7~5
SIM2~SIM0:SIMOperatingModeControl
000:SPImastermode;SPIclockisfSYS/4
001:SPImastermode;SPIclockisfSYS/16
010:SPImastermode;SPIclockisfSYS/64
011:SPImastermode;SPIclockisfSUB
100:SPImastermode;SPIclockisTM0CCRPmatchfrequency/2
101:SPIslavemode
110:I2Cslavemode
111:Unusedmode
ThesebitssetuptheoveralloperatingmodeoftheSIMfunction.Aswellasselecting
iftheI2CorSPIfunction,theyareusedtocontroltheSPIMaster/Slaveselection
andtheSPIMasterclockfrequency.TheSPIclockisafunctionofthesystemclock
butcanalsobechosentobesourcedfromthefSUBorTM0.IftheSPISlaveModeis
selectedthentheclockwillbesuppliedbyanexternalMasterdevice.
Bit4
Unimplemented,readas“0”



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