After Sales
Technical Documentation
RAE/RAK–1N
PDA Hardware
Page 6 – 6
Original, 08/96
Figure 1. PDA Interconnection diagram
1M x 16
FLASH
1M x 16
FLASH
RS232
LCD
io
LCDM module
RBUS
MA9:0,D15:0
PDALCD
sio
1M x 16
DRAM
CPU
sio
1M x 16
FLASH
SA20:1, D15:0
IrDA
MA 9:0/SA20:1
LCD,
Softkeys
D9:0, S7:0
LCD
DRIVER
LCD
UIF–module
LCD
CMT Module
PDAPWRU
MBUS
Audio
io
CMT Module
Control
QWERTY–keypad
Softkeys
CMT Module
PROCU
JTAG
Testpads
E3G
SIRU
EMIU
DBUS
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.
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