Handfree Mode; Timers; Uart - Panasonic EB-G60 Service Manual

5.12.2. Handfree 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 YMU759,
and the voice volume is defined IOTA. Timer 1 in G2 is used to time the period between switching the ringing on and off
to make the tone. For complex ringing tones, the buzzer 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 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
Setting
Timer 2 Function
Setting
The timer unit registers are as follows:
$FFFF:F800 Watchdog_CNTL_TIM
$FFFF:F802 Watchdog_LOAD_TIM
$FFFF:F802 Watchdog_READ_TIM
$FFFF:F804 Watchdog_TIM_MODE
$FFFE:3800 CNTL_TIMER1
$FFFF:3802 LOAD_TIM1
$FFFF:3804 READ_TIM1
$FFFE:6800 CNTL_TIMER2
$FFFF:6802 LOAD_TIM2
$FFFF:6804 READ_TIM2

5.14. UART

G2 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.
TX_MODEM
RX_MODEM
DSR_MODEM
RTS_MODEM
CTS_MODEM
Registers for the UARTs are located from $FFFF : 5 000 to $FFFF : 5011 (UART / IrDA) and from $FFFF : 5800 to
$FFFF : 5811 (UART / modem).
= Buzzer Timer
= Tone frequency
= N/A
= N/A
Watchdog control
Load Watchdog
Read Watchdog
Watchdog Mode
Control Timer 1
Load Timer 1
Read Timer 1
Control Timer 2
Load Timer 2
Read Timer 2
UART / MODEM PORT ASSIGNMENT
G2 SIGNAL PIN No.
B9
A9
D9
E8
C9
Read/Write
Write only
Read only
Read/Write
Read/Write
Read/Write
Read only
Read/Write
Read/Write
Read only
FUNCTION
Transmit Data
Receive Data
Data Set Ready
Request To Send
Clear To Send
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I/O
O
I
I
O
I