Timers; Uart - Panasonic EB-X100 Service Manual

5.12.2. Handsfree Mode
A second speaker is mounted in the rear case for speaker operation.
Ring tones and melodies are played via the speaker. The volume level of ring and melody tones are defined by
Melody Generator IC, and the voice volume is defined IOTA. Timer 1 in G2_Lite is used to time the period between
switching the ringing on and off to make the tone. For complex ringing tones, the speaker volume can be altered after
each time-out of Timer 1.

5.13. Timers

There is a watchdog timer and two 16 bit general-purpose timers which can be used either as auto reload or one-shot
timers to provide interrupts to the ARM CPU. A pre-scaler and 16 bits register define the timer clock duration.
The watchdog timer receives a 928 kHz clock signal from the G2_LITE clock module. A combination of pre-scaler and
timer register gives a time range of 1.078 µs to 9.039 s. The general-purpose timers receive a 812.5 kHz clock signal.
Timer range is between 2.4615 µs and 20.649 s.
Timer 1 Function = Buzzer Timer
Setting = Tone frequency
Timer 2 Function = N/A
Setting = N/A
The timer unit registers are as follows:

5.14. UART

G2_LITE has two UART ports, UART modem and UART / IrDA. The UART / modem port is used for optional
accessories. The UART / IrDA port is used for software debug purposes.
G2 SIGNAL
TX_MODEM
RX_MODEM
DSR_MODEM
RTS_MODEM
CTS_MODEM
UART / MODEM PORT ASSIGNMENT
PIN No. FUNCTION
B9 Transmit Data
A9 Receive Data
D9 Data Set Ready
E8 Request To Send
C9 Clear To Send
I/O
O
I
I
O
I
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