TECHNICAL DESCRIPTION
PMCD030901C8 Section 4 Issue 1
Service Manual – 17 – Revision 0
4.5.4 CPU Memory
The phone uses the following memory configuration:
• 256 Mbits Flash memory
• 5 Mbits internal SRAM
• 128 Mbits external PSRAM
Although 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 crystal
and 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 calibrate
crystal tolerance / drift by writing to the compensation registers. This calibration can adjust the clock to a resolution of
1 x 32768 Hz clock period.
Registers for RTC are assigned between $FFFE:1800 - $FFFE:1814.
4.5.6 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. The watchdog timer receives a 928 kHz clock signal from the CALYPSO+ clock
module. 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 UART
CALYPSO+ has three UART ports, MODEM_1, MODEM_2 and UART / IrDA. The MODEM_1 port is used for data
connection, MODEM_2 for interfacing to the Bluetooth IC and UART / IrDA for modem port is used for IrDA data
transmissions.
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 ASSIGNMENT
CALYPSO+ SIGNAL Ball No. FUNCTION I/O
TX_Modem_1 A20 UART serial data TX (SERIAL_DN) O
RX_Modem_1 C18 UART serial data RX (SERIAL_UP) I
CTS_Modem_1 D17 UART Clear to Send (CTS) I
RTS_Modem_1 D16 UART Request to Send (RTS) O
DSR_Modem_1 B19 UART Data Set Ready (DSR) I
TX_Modem_2 D12 Bluetooth TX Data O
RX_Modem_2 B13 Bluetooth RX Data I
CTS_Modem_2 G12 Bluetooth Clear to Send I
RTS_Modem_2 G13 Bluetooth Ready to Send O
TX_IRDA A18 UART serial data TX (reserved) O
RX_IRDA C17 UART serial data RX (reserved) I
TXIR_IRDA C16 IrDA serial TX data in SIR mode O
RXIR_IRDA B18 IrDA serial RX data in SIR mode I
SD_IRDA D15 IrDA module shutdown (high = shutdown) O
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