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20 Exclusive Control of Ports
The SVT17801 uses five ports exclusively by connecting them to switch ICs as shown in the following. As a result,
the following combination cannot be operated simultaneously.
(1) Write to NAND Flash and the control of LCD touch panel.
(2) Write to NAND Flash and the control of power switch using standby.
(3) Write to NAND Flash and the control of 7th pin/9th pin on J8 connector.
Specifically, the five ports are used exclusively by switching H/L of P45 as shown in the following table.
Table 20.1 P45 Status and Connection Status of PC3, PC2, P34, P33, and PA2
P45
PC3
H
NAND Flash
L
J8 connector
Note that the P45 port becomes an input port immediately after reset has been released. In this status, P45 is pulled
down to LOW.
The following diagram shows a circuit in this area.
S1C17801
S5U1C17801T1100 HARDWARE MANUAL
(SOFTWARE EVALUATION TOOL FOR S1C17801)
PC2
NAND Flash
NAND Flash
Power switch
LCD module
PC3
PC2
P34
P33
PA2
P45
R84
47K
Fig. 20.1 Switch IC Connection Circuit
EPSON
20 EXCLUSIVE CONTROL OF PORTS
P34
P33
NAND Flash
LCD module
U27 TS5A3159A
4
1
6
3
V
G
V
DD
C27
0.1µF
U28 TS5A3159A
4
1
6
3
V
G
V
DD
C28
0.1µF
U29 TS5A3159A
4
1
6
3
V
G
V
DD
C39
0.1µF
U30 TS5A3159A
4
1
6
3
V
G
V
DD
C40
0.1µF
U31 TS5A3159A
4
1
6
3
V
G
V
DD
C50
0.1µF
PA2
NAND Flash
J8 connector
ALE (NAND)
7pin (J8 connector)
R56
10K
CLE (NAND)
POWER SW
WE (NAND)
TOP (LCD module)
R68
10K
RE (NAND)
LEFT (LCD module)
R71
10K
CE (NAND)
9pin (J8 connector)
R67
10K
43
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