Samsung SGH-P400 Service Manual page 10

Gsm telephone

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SGH-P400 Circuit Description

Some PPI pins has many special functions. CP_KB[0~9] receive the status

from key FPCB and are used for the communicatios using

IRDA(IRDA_RX/TX/EN) and data link

cable(DEBUG_DTR/RTS/TXD/RXD/CTS/DSR). And UP_CS/SCLK/SDI, control

signals for PSC2006 are outputted through PPI pins. It has signal port for

charging(CHG_DET, CHG_STAT0), SIM_RESET and FLIP_SNS with which we

knows open.closed status of folder. It has JTAG control pins(TDI/TDO/TCK)

for ARM core and DSP core. It recieves 13MHz clock in CKI pin from external

TCXO and receives 32.768KHz clock from X1RTC. ADC(Analog to Digital

Convertor) part receives the status of temperature, battery type and battery

voltage. And control signals(DSP_INT, DSP_IO and DSP_RWN) for DSP core are

used. It enables main LCD and small LCD with DSP IP pins.

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