Casio DT-940 Service Manual page 55

6.3 SYSTEM DIAGRAM
SH7020
CPU RAM 1KB
Bus State
Controller
PBXX
Stacked MCP
PSRAM: 4MB
FROM: 16MB
ASIC
(S1L51253B22F100)
LCDC
Backlight
ON/OFF
Scanner
LCD &
LED
Backlight
Display System
PROM/
Mask ROM
DMA
Controller
Bank
Swich
System Clock
4.9152MHz
X32.7680K
X14.7456M
X48M
RTC
BSC CPC
LSC IRIF
IrDA
Module
IrDA 1.1
Laser
Communication
System
Unit
Laser
Scanner
System
Backlight ON/OFF
Serial I/F 1 Serial I/F 2
Interrupt
Controller
Input
Signal
PBXX
LED Green
Clock for
Buzzer
IHC
SIF BZC
Bluetooth Buzzer
Module
Notification System
Antenna
Bluetooth
Communication
System
― 53 ―
16bit Integrated
Timer Pulse Unit
Watch Dog
Timer
PBXX
Vibrator Power Supply
LED Red
LED Blue Sub
BATT
NLC PMU
Key Backlight
Key & Switch System
User Break
Controller
Programable
Timing Pttern
Controller
Circuit
Main
Battery
KBC
Trigger
Key
Key &