User Guide

PAMS
Technical Documentation
NSB–1
System Module
Original 06/98
Page 3 – 24
The MAD operates from a 13 MHz system clock, which is generated from
the 13Mhz VCXO frequency. The MAD 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 MAD, which is used for the sleep
mode timing. The sleep clock is active when there is a battery voltage
available i.e. always when the battery is connected.
Memories
The MCU program code resides in an external program memory. MCU
work (data) memory size is 512kbits. A serial EEPROM is used for stor-
ing the system and tuning parameters, user settings and selections, a
scratch pad and a short code memory. The EEPROM size is 64kbits.
The memory variation is managed using memory components with the
same packages and pinouts for all memory sizes of the given types. The
system parameters contain information of the used memories in that end
product. The selected memory packages are TSOP48 for ROM,
STSOP32 for RAM and SO8S for EEPROM .
The used flash memories are capable to perform erase and write opera-
tions with the supplied 3V programming voltage.
The BusController (BUSC) section in the MAD decodes the chip select
signals for the external memory devices and the system logic. BUSC con-
trols internal and external bus drivers and multiplexers connected to the
MCU data bus. The MCU address space is divided into access areas with
separate chip select signals. BUSC supports a programmable number of
wait states for each memory range.
Program Memory
The MCU program code resides in the program memory. The program
memory size is 8Mbits (512kx16) The default package is TSOP48.
The power down pin of FLASH is utilized in the system sleep mode by
connecting the VCXOPwr to the flash power down pin to minimize the
flash power consumption during the sleep.