Panasonic EB-G450 Technical Manual page 23

6.2.4 CPU Memory
The memory requirements for G450 are;
1 4Mbit 3V FLASH organised as 256k * 16
2 1Mbit 3V RAM organised as 128k * 8
3 16kbit 3V Serial EEPROM as 2k * 8
6.2.5 LCD
The LCD assembly is a subassembly comprising of LCD glass and driver chip with connection to the Logic PCB.
A 4 line by 12 character LCD is used to give maximum display information. The display is based on the G500
dispaly.
A Hitachi HD66717 character display driver is used.
6.2.6 Microphone
The microphone is the same type used on G500.
6.2.7 Buzzer
The volume level of the buzzer is defined by the 6 bit PWM register setting in GEMINI I/O. The buzzer tune is then
superimposed on this level using software.
Timer 1 in GEMINI is used to time the period between switching the buzzer on, and off to make the tune. For more
complex buzzer ringing tunes, the buzzer volume level can also be altered after each time-out of timer 1.
Figure 3: Buzzer Control Circuit
MCUK971001G8
Technical Guide
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GEMINI Pin Description
59 Used as nTSPEN (4) (PLL_STRB)
60 RF signal TXON
61 RF signal PAON
62 Used as TSPEN (4) (IFAGCEN)
BU from
Gemini
VBAT
R503
BUZZER
D401
R2
Q1
R1
Section 6
6 - 3
BASEBAND OVERVIEW
450-0603
Issue 1
Revision 0