20
EXCLUSIVE CONTROL OF PORTS
S5U1C17801T1100 HARDWARE MANUAL
EPSON
43
(SOFTWARE EVALUATION TOOL FOR S1C17801)
20
Exclusive Control of Ports
The SVT
17801
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
7
th pin/
9
th pin on J
8
connector.
Specifically, the five ports are used exclusively by switching H/L of P
45
as shown in the following table.
Table
20
.
1
P
45
Status and Connection Status of PC
3
, PC
2
, P
34
, P
33
, and PA
2
P
45
PC
3
PC
2
P
34
P
33
PA
2
H
NAND Flash
NAND Flash
NAND Flash
NAND Flash
NAND Flash
L
J
8
connector
Power switch
LCD module
LCD module
J
8
connector
Note that the P
45
port becomes an input port immediately after reset has been released. In this status, P
45
is pulled
down to LOW.
The following diagram shows a circuit in this area.
V
DD
C50 0.1µF
R67
10K
R84
47K
4
6
1
3
4
6
1
3
4
6
1
3
4
6
1
3
4
6
V
G
V
G
V
G
V
G
V
G
1
3
R71
10K
R68
10K
R56
10K
5
2
V
DD
C40 0.1µF
5
2
V
DD
C39 0.1µF
5
2
V
DD
C28 0.1µF
5
2
V
DD
C27 0.1µF
U27 TS5A3159A
ALE (NAND)
7pin (J8 connector)
CLE (NAND)
POWER SW
WE (NAND)
TOP (LCD module)
S1C17801
PC3
PC2
P34
P45
P33
PA2
U28 TS5A3159A
U29 TS5A3159A
U30 TS5A3159A
U31 TS5A3159A
5
2
RE (NAND)
LEFT (LCD module)
CE (NAND)
9pin (J8 connector)
Fig.
20
.
1
Switch IC Connection Circuit
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