Modes Of Operation - Nokia 9000i Service Manual

RAE/RAK–1N
PDA Hardware
CMT Module
MBUS
Audio
PDAPWRU
DBUS
Testpads
RBUS
RS232
IrDA
SIRU

Modes of Operation

In principle there are four different operation modes
– fully on mode
– CPU core off mode (NAP)
– SUSPEND mode
– power supply off (Battery removed
The PDA module is always powered when a battery with adequate charge
level is connected. Power saving in different modes is achieved by
disabling clocks from functional blocks in an advanced manner. In the
FULLY ON mode, all circuits are clocked, in the NAP mode, the CPU core
is not clocked but all other circuits are clocked normally. In SUSPEND
mode only the Real Time Clock (RTC) is clocked; DRAM is in self–refresh
mode when the system is in SUSPEND mode. Asynchronous events, e.g.,
key presses and the lid being opened/closed, are able to wakeup the
system from NAP and SUSPEND modes.
RTC is powered from the main battery as long as possible; in power
supply OFF mode RTC is powered from the primary type of the backup
battery.
Page 6 – 6
CMT Module
MA9:0,D15:0
PROCU
1M x 16
DRAM
Control
io io
MA 9:0/SA20:1
LCD,
sio
Softkeys
CPU
E3G
JTAG
sio
D9:0, S7:0
QWERTY–keypad
CMT Module
Figure 1. PDA Interconnection diagram
Technical Documentation
SA20:1, D15:0
1M x 16
1M x 16
FLASH
FLASH
LCDM module
PDALCD
LCD
DRIVER
EMIU
UIF–module
Original, 08/96
After Sales
1M x 16
FLASH
LCD
Softkeys
LCD LCD