GMS81508B HYNIX [Hynix Semiconductor], GMS81508B Datasheet - Page 71

• Manufacturer Part Number: GMS81508B
• Description: HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: HYNIX [Hynix Semiconductor]

GMS81508B/16B/24B
is external pull-down register, it is set to low.
68
OUTPUT PIN
Weak pull-up current flows
In the left case, much current flows from port to GND.
ON
OFF
INPUT PIN
X
V
X
DD
i
i
GND
GND
internal
pull-up
Figure 18-3 Application Example of Unused Output Port
Figure 18-2 Application Example of Unused Input Port
ON
OFF
ON
OFF
V
V
DD
DD
O
O
OPEN
V
O
O
DD
V
OPEN
DD
OUTPUT PIN
ON
OFF
X
In the left case, Tr. base current flows from port to GND.
To avoid power consumption, there should be low output
to the port.
INPUT PIN
When port is configure as an input, input level should
be closed to 0V or 5V to avoid power consumption.
Very weak current flows
i
X
i
GND
L
V
OPEN
HYUNDAI MicroElectronics
DD
DEC. 1999 Ver 1.04
OFF
ON
O
i=0
i=0
i=0
GND
O
O
L
V
DD
V
DD
GND