9-1. Block Diagram. Casio BN-20, BN-10, FA-127
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9. CIRCUIT EXPLANATION
9-1. Block Diagram
(BN-20 only)
EL driver
DC/AC inverter
(BN-20 only)
EL
34.5 kHz
KEYS
Address bus
KI/KO
TX/RX
Clock
CPU
(LSI1)
Buzzer
Common-
LCD
319
×
160 dots
TAB(LSI3)
Clock
Segment-TAB
(LSI4, 5)
10.14 MHz 32.768 kHz
Bias generator for LCD (IC708)
Data bus
RX/TX
TX/RX
Gate array
(LSI2)
TX/RX
Electronic contrast adjustment
RX/TX
MODEM
BW-100
Line driver/receiver
(IC501)
TX/RX
VLCO
POWER SUPPLY
V5EXT
V2SYS
V3SYS
CPU
TELEPHONE
CPU/Gate array etc.
RX/TX
MINI CRADLE
1 Mbits S-RAM
(LSI303)
16 Mbits
MASK ROM
(LSI301)
8 Mbits
FLASH ROM
(LSI304)
(BN-20 only)
8 Mbits
FLASH ROM
(LSI306)
8 Mbits
FLASH ROM
(LSI308)
START BUTTON
V5SYS RS-232C
Personal computer
AC Adapter
AD-A70140
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