Panasonic EB-X70 Service Manual

Also see for EBX70 - CELL PHONE: Operating instructions Operating instructions Technical information Service manual

TECHNICAL DESCRIPTIONPMCD030901C8 Section 4 Issue 1Service Manual – 17 – Revision 04.5.4 CPU MemoryThe phone uses the following memory configuration:• 256 Mbits Flash memory• 5 Mbits internal SRAM• 128 Mbits external PSRAMAlthough CALYPSO+ has 5 Mbits internal memory, only the external PSRAM memory is protected by the backup battery.4.5.5 Real Time Clock (RTC)Clock functions are provided by a Real Time Clock built into CALYPSO+. The module is synchronised by a 32.768 kHz crystaland is powered via a dedicated regulator in SYREN and is backed up by a 2.5 V cell.CALYPSO+ has a clock auto compensation function to take into account any inaccuracies of the crystal. It is able to calibratecrystal tolerance / drift by writing to the compensation registers. This calibration can adjust the clock to a resolution of1 x 32768 Hz clock period.Registers for RTC are assigned between $FFFE:1800 - $FFFE:1814.4.5.6 TimersThere is a watchdog timer and two 16 bit general-purpose timers which can be used either as auto reload or one-shot timersto provide interrupts to the ARM CPU. The watchdog timer receives a 928 kHz clock signal from the CALYPSO+ clockmodule. A combination of pre-scaler and timer register gives a timeout range of 1.078 s to 9.039 s.The general purpose timers receive a 812.5 kHz clock signal.4.5.7 UARTCALYPSO+ has three UART ports, MODEM_1, MODEM_2 and UART / IrDA. The MODEM_1 port is used for dataconnection, MODEM_2 for interfacing to the Bluetooth IC and UART / IrDA for modem port is used for IrDA datatransmissions.Registers for the UARTs are located from $FFFF:5000 to $FFFF:5011 (UART / IrDA), $FFFF:5800 to $FFFF:5811(MODEM_1) and from $FFFF:6000 to $FFFF:6011 (MODEM_2).UART / MODEM PORT ASSIGNMENTCALYPSO+ SIGNAL Ball No. FUNCTION I/OTX_Modem_1 A20 UART serial data TX (SERIAL_DN) ORX_Modem_1 C18 UART serial data RX (SERIAL_UP) ICTS_Modem_1 D17 UART Clear to Send (CTS) IRTS_Modem_1 D16 UART Request to Send (RTS) ODSR_Modem_1 B19 UART Data Set Ready (DSR) ITX_Modem_2 D12 Bluetooth TX Data ORX_Modem_2 B13 Bluetooth RX Data ICTS_Modem_2 G12 Bluetooth Clear to Send IRTS_Modem_2 G13 Bluetooth Ready to Send OTX_IRDA A18 UART serial data TX (reserved) ORX_IRDA C17 UART serial data RX (reserved) ITXIR_IRDA C16 IrDA serial TX data in SIR mode ORXIR_IRDA B18 IrDA serial RX data in SIR mode ISD_IRDA D15 IrDA module shutdown (high = shutdown) O