Sony CMD-CD18 Service Manual page 21

7.2 Baseband Block Diagram
LCD
Keypad
Ringer
Back
light
Jog dial
SIM Interface
/3/5 Volt SIM
32 kHz clock
data/address/control signals
Flash/RAM
13 MHz clock
A/D converter
SCI
JTAGISSI
Power / Power management
circuitry
VCHG
Accessory - Power
VBATT
RX/TX
Accessory - ID/Detect
Audio - I/O
Global I/O connector
21
RF
circuit