GMS82524 Datasheet, PDF (61/93 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS82512/16/24
HYUNDAI MicroElectronics
is external pull-down register, it is set to low.
INPUT PIN
V_DD
V_DD
internal
pull-up
i
GND
V_DD
X
Weak pull-up current flows
V_DD
O
OPEN
O
INPUT PIN
OPEN
i
V_DD
i=0
O
Very weak current flows
X
i=0
GND
O
When port is configure as an input, input level should
be closed to 0V or 5V to avoid power consumption.
Figure 16-2 Application Example of Unused Input Port
OUTPUT PIN
ON
OFF _i
GND
X
ON
OPEN
OFF
O
V_DD
ON
O ^OFF
In the left case, much current flows from port to GND.
OUTPUT PIN
ON
V_DD
L
OFF _i
GND
OFF
V_DD
L
ON i=0
GND
X
O
In the left case, Tr. base current flows from port to GND.
To avoid power consumption, there should be low output
to the port.
Figure 16-3 Application Example of Unused Output Port
58
FEB. 2000 Ver 1.00