ra8806 RAIO Technology Inc., ra8806 Datasheet - Page 107

• Manufacturer Part Number: ra8806
• Description: Two Layers Character/graphic Lcd Controller
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.2
RA O
SCAN_BUSY
SCAN_BUSY
SCAN_BUSY
SCAN_BUSY
SCAN_BUSY
MPU 8080 The Worst case!!
MPU 8080 The Worst case!!
MPU 8080 The Worst case!!
MPU 6800 The Worst case!!
MPU 6800 The Worst case!!
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TECHNOLOGY INC.
ZWR
ZWR
ZWR
ZWR
ZWR
RD
RD
RD
RD
RD
Figure 6-80 : The Suggestion ITCR value for MPU 8080 Interface to Eliminate Flicker
Figure 6-81 : The Suggestion ITCR value for MPU 6800 Interface to Eliminate Flicker
Read Status cycle
Read Status cycle
Read Status cycle
Read Status cycle
Read Status cycle
SCAN_BUSY
SCAN_BUSY
Figure 6-79 : Eliminate Flicker (2) ITCR Cycle Too Short
MPU cycle
MPU cycle
Tcyc
Tcyc
Tcyc
Tcyc
Tcyc
XCLK
XCLK
LP
LP
ITCR period too short
ITCR period too short
ITCR
ITCR
ITCR duration
ITCR duration
ITCR duration
ITCR duration
ITCR duration
Read Status cycle
Read Status cycle
Read Status cycle
Read Status cycle
Read Status cycle
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Confliction!
Confliction!
Tcyc
Tcyc
Tcyc
Tcyc
Tcyc
Two Layers Character/Graphic LCD Controller
: Check status bit-6 = 0
: Check status bit-6 = 0
: Check status bit-6 = 1
: Check status bit-6 = 1
: Memory access cycle
: Memory access cycle
MEM write cycle
MEM write cycle
MEM write cycle
tsys = 1/CLK
tsys = 1/CLK
tsys = 1/CLK
M : REG[01h] = 00h
M : REG[01h] = 00h
M : REG[01h] = 00h
So ITCR suggestion value is :
So ITCR suggestion value is :
So ITCR suggestion value is :
ITCR duration=ITCR x tc x M > 2.5 x Tcyc
ITCR duration=ITCR x tc x M > 2.5 x Tcyc
ITCR duration=ITCR x tc x M > 2.5 x Tcyc
tc = 1/CLK
tc = 1/CLK
M : REG[01h] = 00h
M : REG[01h] = 00h
So ITCR suggestion value is :
So ITCR suggestion value is :
ITCR duration=ITCR x tc x M > 2.5 x Tcyc
ITCR duration=ITCR x tc x M > 2.5 x Tcyc
MEM write cycle
MEM write cycle
REG[01h] = 01h
REG[01h] = 01h
REG[01h] = 01h
REG[01h] = 10h
REG[01h] = 10h
REG[01h] = 10h
REG[01h] = 11h
REG[01h] = 11h
REG[01h] = 11h
REG[01h] = 01h
REG[01h] = 01h
REG[01h] = 10h
REG[01h] = 10h
REG[01h] = 11h
REG[01h] = 11h
CLK : system clock
CLK : system clock
CLK : system clock
CLK : system clock
CLK : system clock
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M=8
M=8
M=8
M=4
M=4
M=4
M=2
M=2
M=2
M=1
M=1
M=1
M=8
M=8
M=4
M=4
M=2
M=2
M=1
M=1
RA8806