Nokia NSE-3 SERIES, Service Manual

Page: 40 / 217

PAMS
Technical Documentation
NSE–3
System Module
Original 11/97
Page 3 – 34
– CODER (Block encoding/decoding and A51&A52 ciphering)
– AccIF(Accessory Interface)
– SCU (Synthesizer Control Unit for controlling 2 separate
synthesizer)
– UIF (Keyboard interface, serial control interface for COBBA
PCM Codec, LCD Driver and CCONT)
– SIMI (SimCard interface with enhanched features)
– PUP (Parallel IO, USART and PWM control unit for vibra
and buzzer)
The MAD2 operates from a 13 MHz system clock, which is generated
from the 13Mhz VCXO frequency. The MAD2 supplies a 6,5MHz or a
13MHz internal clock for the MCU and system logic blocks and a 13MHz
clock for the DSP, where it is multiplied to 52 MHz DSP clock. The system
clock can be stopped for a system sleep mode by disabling the VCXO
supply power from the CCONT regulator output. The CCONT provides a
32kHz sleep clock for internal use and to the MAD2, which is used for the
sleep mode timing. The sleep clock is active when there is a battery volt-
age available i.e. always when the battery is connected.
Pin
N:o
Pin Name Pin
Type
Connected
to/from
Drive
req.
mA
Reset
State
Note Explanation
1 MCUGenOut5 O Audio 2 0 MCU General
purpose output
port
2 MCUGenOut4 O N101 2 0 MCU General
purpose output
port
3 LEADGND Lead Ground
4 MCUGenOut3 O 2 0 MCU General
purpose output
port
5 VCC IO VCC in
3325c10
Power
6 MCUGenOut2 O 2 0 MCU General
purpose output
port
7 MCUGenOut1 O MCU
memory
2 0 MCU General
purpose output
port
8 MCUGenOut0 O 2 1 LoByteSelX
in 16–bit
mode
MCU General
purpose output
port
9 Col4 I/O UIF 2 Input program-
mable pullup
PR0201
I/O line for key-
board column 4