Chapter 4
4 - 8
Real time clock
As a device for the real time clock, RTC-4574SAA with built-in
32.768-kHz crystal resonator is used. Since the real time clock is driven by
[VBAT], it does not operate if the Ni-MH battery (BT1) is not mounted.
RESET_L
( 7,8,9,10,12,18,20 )
CE1
13
CLK
11
DATA
12
FOUT
2
FCON
14
AIRQ
9
VDD
7
GND1
1
TIRQ
10
NC
3
NC
4
NC
5
NC
6
CE0
8
IC23
RTC-4574SAA
VBAT
RTCCE
RTCCLK
RTCDAT
C65
0.1uFFZ
DG
( 10 )
( 7 )
( 7 )
( 7 )
Wait control section
GAL16LV8C-15J of CMOS PLD is used for the weight control section.
This device processes wait signals output from control ICs such as the
MAIN G/A and the LCD controller, and outputs optimum wait signals to
the MAIN CPU.
MWAIT_L
MGAWAIT_L
( 8 )
( 12 )
PC1WAIT_L
+3.3V
R298
62F
DG
RESET_L
( 7,8,9,10,12,18,20 )
MCKIO
( 6 )
SIOCS_L
IOR_L
IOW_L
MDRACK1_L
( 7,13 )
MRD_1_L
( 7,9,12,18 )
I0/CLK
1
I1
2
I2
3
I3
4
I4
5
I5
6
I6
7
I7
8
I8
9
GND
10
VCC
20
I/O7
19
I/O6
18
I/O5
17
I/O4
16
I/O3
15
I/O2
14
I/O1
13
I/O0
12
I9/OE
11
IC22
GAL16LV8C-15J
DG
C246
0.01UFFZ
R233
62F
LANWAIT_L
( 19 )
( 8 )
( 8 )
( 8 )
R23
10KF
+3.3V
LCDWAIT_L
SIOR_L
SIOW_L
SIOAEN
( 13 )
( 18 )
( 13 )
( 13 )
( 7 )
R413
51F
R414
51F
R478
1.0KF
R415
62F
R416
62F
R418
62F
Summary of Contents for FX-7302
Page 10: ...viii ...
Page 12: ......
Page 60: ...Chapter 2 2 40 ...
Page 62: ......
Page 86: ...Chapter 4 4 18 ...
Page 87: ...4 19 MAIN BOARD circuit diagram PCB 6956B Power connection table No 1 ...
Page 114: ...4 46 ...
Page 116: ......
Page 130: ......
Page 131: ...6 1 MAIN BOARD PCB 6956B component side ...
Page 132: ...6 2 MAIN BOARD PCB 6956B soldering side ...
Page 133: ...6 3 OPERATION BOARD PCB 6957B component side ...
Page 134: ...6 4 OPERATION BOARD PCB 6957B soldering side ...
Page 135: ...6 5 ECG AMP BOARD PCB 6731D component side ...
Page 136: ...6 6 ECG AMP BOARD PCB 6731D soldering side ...
Page 137: ...6 7 MARK SENSER BOARD PCB 6942 component side ...
Page 138: ...6 8 MAGAZIN UP BOARD PCB 6943A component side ...
Page 139: ...6 9 CONNECTION BOARD PCB 7028 component side ...
Page 140: ...6 10 ...
Page 142: ......
Page 151: ...7 9 Outline view 255 315 70 76 ...
Page 152: ...7 10 ...
Page 154: ......
Page 160: ...Chapter 8 8 6 ...
Page 161: ......