Holtek HT66F20 - Page 238

Rev. 2.50 238 June 22, 2017 Rev. 2.50 239 June 22, 2017
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
UART Module A.C. Characteristics
Ta=25°C
Symbol Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
t
CP
SCK Period (t
CH
+ t
CL
)
3.0V — 62.5 — — ns
5.0V — 50.0 — — ns
t
CH
SCK High Time
3.0V — 28 — — ns
5.0V — 22 — — ns
t
CL
SCK Low Time
3.0V — 28 — — ns
5.0V — 22 — — ns
t
CSW
SCS High Pulse Width
3.0V — 500 — — ns
5.0V — 400 — — ns
t
CSS
SCS to SCK Setup Time — — 100 — — ns
t
CSH
SCS to SCK Hold Time — — 0 — — ns
t
SDS
SDI to SCK Setup Time — — 100 — — ns
t
SDH
SDI to SCK Hold Time — — 0 — — ns
t
R
SPI Output Rise Time — — — 10 — ns
t
F
SPI Output Fall Time — — — 10 — ns
t
W
SPI Data Output Delay Time — — 0 — — ns
UART Module Functional Description
TheembeddedUARTModuleisfull-duplexasynchronousserialcommunicationsUARTinterface
thatenablescommunicationwithexternaldevicesthatcontainaserialinterface.TheUART
functionhasmanyfeaturesandcantransmitandreceivedataseriallybytransferringaframeof
datawitheightorninedatabitspertransmissionaswellasbeingabletodetecterrorswhenthe
dataisoverwrittenorincorrectlyframed.InterconnectionbetweentheMCUandtheUARTmodule
isimplementedbyinternallyconnectingtheMCUMasterSPIinterfacetotheUARTSlaveSPI
interface.AlldatatransmissionsandreceptionsbetweenMCUandUARTmoduleincludingUART
commandsareconductedalongthisinterconnectedSPIinterface.TheUARTfunctioncontrolis
executedbytheMCUusingitsSPIMasterserialinterface.TheUARTmodulecontainsitsown
independentinterruptwhichcanbeusedtoindicatewhenadatareceptionoccursorwhenadata
transmissionhasterminated.
UART Module Internal Signal
InadditiontotheTXandRXexternalpinsdescribedabovethereareotherMCUtoUARTModule
interconnectinglinesthataredescribedinthefollowingtable.Notethattheselinesareinternalto
thedeviceandarenotbondedtoexternalpins.