ST2202A
9. GPIO
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Portꢀdataꢀregisters:ꢀPA
Portꢀdirectionꢀcontrolꢀregisters:ꢀPCA
Portꢀtypeꢀselectꢀregisters:ꢀPSC
Portꢀfunctionꢀselectꢀregisters:ꢀPFCꢀandꢀPFD
Portꢀmiscellaneousꢀcontrolꢀregister:ꢀPMCR
~PE, PLꢀ
TheꢀST2202ꢀconsistsꢀofꢀ48ꢀgeneralꢁpurposeꢀI/Oꢀ(GPIO)ꢀwhichꢀ
areꢀdividedꢀintoꢀsixꢀI/Oꢀports:ꢀPortꢁA/B/C/D/EꢀandꢀPortꢁL.ꢀ
ControlꢀregistersꢀofꢀGPIOꢀareꢀshownꢀasꢀfollowingꢀandꢀinꢀTABLEꢀ
9ꢁ1.ꢀ
~
PCE, PCL
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
TABLE 9-1 Summary Of Control Registers Of GPIO
Address Name
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default
$000 PA
$001 PB
$002 PC
$003 PD
$004 PE
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
Wꢀ
PA[7]ꢀ
PB[7]ꢀ
PC[7]ꢀ
PD[7]ꢀ
PE[7]ꢀ
PL[7]ꢀ
PA[6]ꢀ
PB[6]ꢀ
PC[6]ꢀ
PD[6]ꢀ
PE[6]ꢀ
PL[6]ꢀ
PA[5]ꢀ
PB[5]ꢀ
PC[5]ꢀ
PD[5]ꢀ
PE[5]ꢀ
PL[5]ꢀ
PA[4]ꢀ
PB[4]ꢀ
PC[4]ꢀ
PD[4]ꢀ
PE[4]ꢀ
PL[4]ꢀ
PA[3]ꢀ
PB[3]ꢀ
PC[3]ꢀ
PD[3]ꢀ
PE[3]ꢀ
PL[3]ꢀ
PA[2]ꢀ
PB[2]ꢀ
PC[2]ꢀ
PD[2]ꢀ
PE[2]ꢀ
PL[2]ꢀ
PA[1]ꢀ
PB[1]ꢀ
PC[1]ꢀ
PD[1]ꢀ
PE[1]ꢀ
PL[1]ꢀ
PA[0]ꢀ
PB[0]ꢀ
PC[0]ꢀ
PD[0]ꢀ
PE[0]ꢀ
PL[0]ꢀ
1111ꢀ1111ꢀ
1111ꢀ1111ꢀ
1111ꢀ1111ꢀ
1111ꢀ1111ꢀ
1111ꢀ1111ꢀ
1111ꢀ1111ꢀ
$04C PL
$005 PSC
$008 PCA
$009 PCB
$00A PCC
$00B PCD
$00C PCE
$04E PCL
$00D PFC
$00E PFD
$00F PMCR
PSC[7]ꢀ PSC[6]ꢀ PSC[5]ꢀ PSC[4]ꢀ PSC[3]ꢀ PSC[2]ꢀ PSC[1]ꢀ PSC[0]ꢀ 1111ꢀ1111ꢀ
PCA[7]ꢀ PCA[6]ꢀ PCA[5]ꢀ PCA[4]ꢀ PCA[3]ꢀ PCA[2]ꢀ PCA[1]ꢀ PCA[0]ꢀ 0000ꢀ0000ꢀ
PCB[7]ꢀ PCB[6]ꢀ PCB[5]ꢀ PCB[4]ꢀ PCB[3]ꢀ PCB[2]ꢀ PCB[1]ꢀ PCB[0]ꢀ 0000ꢀ0000ꢀ
PCC[7]ꢀ PCC[6]ꢀ PCC[5]ꢀ PCC[4]ꢀ PCC[3]ꢀ PCC[2]ꢀ PCC[1]ꢀ PCC[0]ꢀ 0000ꢀ0000ꢀ
PCD[7]ꢀ PCD[6]ꢀ PCD[5]ꢀ PCD[4]ꢀ PCD[3]ꢀ PCD[2]ꢀ PCD[1]ꢀ PCD[0]ꢀ 0000ꢀ0000ꢀ
PCE[7]ꢀ PCE[6]ꢀ PCE[5]ꢀ PCE[4]ꢀ PCE[3]ꢀ PCE[2]ꢀ PCE[1]ꢀ PCE[0]ꢀ 0000ꢀ0000ꢀ
PCL[7]ꢀ PCL[6]ꢀ PCL[5]ꢀ PCL[4]ꢀ PCL[3]ꢀ PCL[2]ꢀ PCL[1]ꢀ PCL[0]ꢀ 0000ꢀ0000ꢀ
RXD0ꢀ
RXD1ꢀ
PULLꢀ
R/Wꢀ
R/Wꢀ
R/Wꢀ
TXD0ꢀ
TXD1ꢀ
SRDYꢀ
CS6ꢀ
SSꢀ
CS5ꢀ
MOSIꢀ
CS4ꢀ
MISOꢀ
CS3ꢀ
BCOꢀ
SCKꢀ
CS2ꢀ
TCO1ꢀ
INTXꢀ
CS1ꢀ
TCO0ꢀ
0000ꢀ0000ꢀ
0000ꢀ0000ꢀ
1000ꢀ0000ꢀ
PDBNꢀ INTEGꢀ CSM1ꢀ CSM0ꢀ
ꢀ
ꢀ
Eachꢀsingleꢀpinꢀcanꢀbeꢀprogrammedꢀtoꢀbeꢀinputꢀorꢀoutput.ꢀThisꢀ
isꢀcontrolledꢀbyꢀportꢀdirectionꢀcontrolꢀregistersꢀPCx.ꢀSettingꢀbitꢀ
ofꢀPCxꢀmakesꢀrespectiveꢀpinꢀtoꢀoutput,ꢀandꢀclearingꢀthisꢀbitꢀforꢀ
input.ꢀThereꢀareꢀtwoꢀoptions:ꢀpullꢁup/downꢀforꢀinputsꢀofꢀPortꢁCꢀ
butꢀonlyꢀpullꢁupꢀforꢀinputsꢀofꢀtheꢀotherꢀports.ꢀInꢀcaseꢀofꢀoutput,ꢀ
thereꢀareꢀopenꢁdrain/CMOSꢀoptionsꢀforꢀoutputsꢀofꢀPortCꢀbutꢀ
onlyꢀCMOSꢀforꢀtheꢀotherꢀports.ꢀReferꢀtoꢀTABLEꢀ9ꢁ2.ꢀ
ꢀ
VCC
PULLꢁUP
PMOS
PULLꢁUP
PORT
CONTROL
REGISTER
(ꢀPCRꢀ)
PORT
DATA
REGISTER
(ꢀPDRꢀ)
TABLE 9-2 I/O Types Of GPIO Ports
DATAꢀINPUT
I/O Types
I/O Mode
RD_INPUT
Port-A/B/D/E/L
Pullꢁup/Pureꢀ
CMOSꢀ
Port-C
ꢀ
Input
Pullꢁup/Pullꢁdown/Pureꢀ
Openꢁdrain/CMOSꢀ
FIGURE 9-1 Configuration Of Inputs
Output
ꢀ
ꢀ
Output Mode
ꢀ
Inꢀcaseꢀofꢀoutputꢀfunction,ꢀWriteꢀtoꢀportꢀdataꢀregistersꢀPx
makesꢀpinsꢀtoꢀoutputꢀdesiredꢀvalue.ꢀThisꢀvalueꢀcanꢀalsoꢀbeꢀ
readꢀbackꢀbyꢀreadꢀinstruction.ꢀBesidesꢀPortꢁC,ꢀtheꢀoutputꢀpinsꢀ
areꢀCMOSꢀtype.ꢀPortꢁCꢀhaveꢀtwoꢀoptionsꢀofꢀoutputꢀtypes:ꢀ
openꢁdrainꢀandꢀCMOS,ꢀandꢀisꢀcontrolledꢀbyꢀportꢀtypeꢀselectꢀ
registersꢀPSC.ꢀClearingꢀbitsꢀofꢀregistersꢀPSCꢀisꢀforꢀthatꢀdisableꢀ
PMOSꢀofꢀoutputꢀstageꢀandꢀleftꢀonlyꢀNMOS,ꢀwhileꢀsettingꢀbitsꢀisꢀ
forꢀCMOS.ꢀReferꢀtoꢀFIGUREꢀ9ꢁ2.ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Input Mode
Inꢀcaseꢀofꢀinputꢀfunction,ꢀportꢀdataꢀregistersꢀPxꢀreflectꢀtheꢀ
valuesꢀonꢀassociatedꢀpins.ꢀBesidesꢀreadꢀinstructionꢀforꢀdataꢀofꢀ
signalsꢀinput,ꢀwritingꢀtoꢀregisterꢀPxꢀselectsꢀI/Oꢀtypesꢀofꢀpins,ꢀ
pullꢁupꢀorꢀpullꢁdown.ꢀSettingꢀbitsꢀofꢀallꢀportꢀdataꢀregisterꢀPxꢀtoꢀ
selectꢀpullꢁupꢀtype.ꢀClearingꢀbitsꢀofꢀonlyꢀPCꢀtoꢀselectꢀpullꢁdownꢀ
typeꢀforꢀpinsꢀofꢀPortꢁC.ꢀThereꢀareꢀnoꢀpullꢁdownꢀresistorsꢀforꢀ
PortꢁA/B/D/EꢀandꢀPortꢁL,ꢀtherebyꢀnoꢀpullꢁdownꢀresistorsꢀwillꢀbeꢀ
enabledꢀifꢀclearingꢀbitsꢀofꢀPA,ꢀPB,ꢀPD,ꢀPEꢀandꢀPL.ꢀPullꢁupꢀ
resistorsꢀofꢀPortꢁA/B/D/E/LꢀareꢀalsoꢀcontrolledꢀbyꢀPULLꢀbitꢀ(bit7ꢀ
ofꢀportꢀmiscellaneousꢀregisterꢀPMCR),ꢀ“0”ꢀisꢀtoꢀdisable,ꢀwhileꢀ
“1”ꢀisꢀtoꢀenableꢀthem.ꢀTheꢀpullꢁup/pullꢁdownꢀresistorsꢀofꢀPortꢁCꢀ
areꢀfurtherꢀcontrolledꢀbyꢀbitsꢀofꢀportꢀtypeꢀselectꢀregistersꢀPSC.ꢀ
TheyꢀworkꢀinꢀtheꢀsameꢀwayꢀwithꢀPULLꢀbitꢀofꢀPMCRꢀbutꢀonlyꢀonꢀ
singleꢀpin,ꢀ“0”ꢀisꢀtoꢀdisable,ꢀwhileꢀ“1”ꢀisꢀtoꢀenable.ꢀReferꢀtoꢀ
FIGUREꢀ9ꢁ1.ꢀ
ꢀ
FIGURE 9-2 Configuration Of Outputs
Verꢀ2.5ꢀ
15
/75
ꢀ
9/16/2008ꢀ
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
