ST7735
9.2.2 Read cycle sequence
The read cycle (RDX high-low-high sequence) means that the host reads information from LCD driver via interface. The
driver sends data (D[17:0]) to the host when there is a falling edge of RDX and the host reads data when there is a rising
edge of RDX.
Fig. 9.2.3 8080-series RDX protocol
Note: RDX is an unsynchronized signal (It can be stopped).
Readꢁparameter
Readꢁdisplayꢁdata
D[17:0]
RESX
CSX
S
CMD
DM
PA
CMD
DMꢁ&ꢁdata
Data
Data
P
“1”
D/CX
RDX
WRX
D[17:0]
S
CMD
CMD
DM
PA
CMD
DMꢁ&ꢁdata
DMꢁ&ꢁdata
Data
Data
P
HiꢀZ
HiꢀZ
HostꢁD[17:0]
HostꢁtoꢁLCD
S
S
CMD
HiꢀZ
P
P
HiꢀZ
DriverꢁD[17:0]
LCDꢁtoꢁHost
DM
PA1
PANꢀ2
PANꢀ1
SignalsꢁonꢁD[17:0],ꢁD/CX,ꢁR/WX,ꢁEꢁ
pinsꢁduringꢁCSX=1ꢁareꢁignored.
CMD:ꢁwriteꢁcommandꢁcode
PA:ꢁparameterꢁorꢁdisplayꢁdata
Fig. 9.2.4 8080-series parallel bus protocol, read data from register or display RAM
V1.7
28
2009-12-04
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
