Hyundai Micro Electronics
GMS81C2020/GMS81C2120
OUTPUT PIN
ON
OUTPUT PIN
ON
V
ON
DD
V
DD
OPEN
L
L
OFF
OFF
ON
O
i=0
OFF
OFF
i
i
V
DD
GND
GND
GND
ON
X
O
X
OFF
In the left case, Tr. base current flows from port to GND.
To avoid power consumption, there should be low output
to the port .
O
In the left case, much current flows from port to GND.
Figure 21-3 Application Example of Unused Input Port
Minimizing Current Consumption in Stop Mode
VSS or at VDD (or as close to rail as possible).
The Stop mode is designed to reduce power consumption.
To minimize current drawn during Stop mode, the user
should turn-off output drivers that are sourcing or sinking
current, if it is practical. Weak pull-ups on port pins should
be turned off, if possible. All inputs should be either as
An intermediate voltage on an input pin causes the input
buffer to draw a significant amount of current.
Oscillator
(XI pin)
Internal
Clock
External
Interrupt
Clear Basic Interval Timer
STOP Instruction Execution
BIT
Counter
N-1
N
N+1
N+2
N-2
00
01
FE FF 00
00
Normal Operation
Stabilization Time
> 20mS
STOP Mode
Normal Operation
t
ST
Figure 21-4 Timing of STOP Mode Release by External Interrupt
Nov. 1999 Ver 0.0
preliminary
77
HYNIX [ HYNIX SEMICONDUCTOR ]
