User Guide

PAMS
System Module DB6
NHB–3
Technical Documentation
Original 26/97
Page 4–17
CTRLU
Introduction
The Control block contains a microcomputer unit (MCU) and three memory cir-
cuits (FLASH, SRAM, EEPROM), a 20–bit address bus and an 8–bit data bus.
Main Features of the CTRLU Block
MCU functions:
– system control
– communication control
– user interface functions
– authentication
– RF monitoring
– power up/down control
– accessory monitoring
– battery monitoring and charging control
– self–test and production testing
– flash loading
External Signals and Connections, Inputs
Signal name Signal description From
VL1 Power supply voltage for CTRLU block PWRU
VREF Reference voltage for MCU AD–converter PWRU
VBATDET Battery voltage detection PWRU
VC Charger voltage monitoring PWRU
EROMSELX Chip select for the EEPROM memory ASIC
ROMSELX Chip select for the FLASH memory ASIC
RAMSELX Chip select for the SRAM memory ASIC
RESETX Reset signal for MCU ASIC
NMI Non–maskable interrupt request ASIC
MCUCLK Main clock for MCU ASIC
IRQX Interrupt request ASIC
PCMCDO Audio codec control data receiving AUDIO
TRF RF–module temperature detection RF
VF Programming voltage for flash memory system con.
HOOK_RXD2 The use of handsfree monitoring. Flash system con.
programming data input on the production
line.