User Guide

PAMS
System Module DB6
NHB–3
Technical Documentation
Original 26/97
Page 4–20
CTRLU – DSPU
MCU and DSP communicate through ASIC. ASIC has an MCU mail-
box and a DSP mailbox. MCU writes data to DSP mailbox where
DSP can only read the incoming data. In MCU mailbox the data
transfer direction is the opposite. When power is switched on the
MCU loads data from the flash memory to DSP‘s external memory
through this mailbox.
CTRLU – AUDIO
CTRLU control audio selections MIC/XMIC, EAR/XEAR and those
lines gains. Also CTRLU control tone, ring and dtmf generator.
When MCU drive the chip select signal XSELPCMC low, MCU writes
or reads control data to or from the speech codec registers at the
rate defined by PCMCLK. PCMCDI is an output data line from MCU
to codec and PCMCDO is an input data line from codec to MCU.
CTRLU – RF/BATTERY Monitoring
MCU has internal 8 channel 10 bit AD converter. Following signals
are used to monitor battery, charging, accessories and RF:
BTYPE battery size
TBAT battery temperature (used also for vibrabattery control)
VBATDET battery voltage
VC charging voltage
TRF RF temperature
CTRLU – UIF
UIM card, keyboard and display interface goes through ASIC.
BUZZER, BACKLIGHT and CALL_LED are controlled directly from
MCU.
CTRLU – ACCESSORIES
M2BUS is used to control external accessories. This interface can
also be used for factory testing and maintenance purposes.
PHFS_TXD2 is used to turn power on to HF accessories.
JCONN is used to indicate that junction box is connected. DC level
come from system connector line MIC_JCONN. Phone can also en-
ter minimum mode when M2BUS is connected to MIC_JCONN line.
TBAT is used to control vibrabattery. (Used also for battery tempera-
ture measurement.)
HOOK indicates accessories hook state. Line is connected to MCU
A/D–input.