GMS87C4060 Datasheet, PDF (83/102 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

PRELIMINARY
GMS81C4040/87C4060
INPUT PIN
V_DD
V_DD
internal
pull-up
i
GND
V_DD
X
Weak pull-up current flows
V_DD
O
OPEN
O
OUTPUT PIN
ON
OFF _i
GND
X
ON
OPEN
OFF
O
V_DD
ON
OFF
O
In the left case, much current flows from port to GND.
INPUT PIN
OPEN
i
V_DD
i=0
O
Very weak current flows
X
i=0
GND
O
When port is configured as an input, input level should
be closed to 0V or 5V to avoid power consumption.
OUTPUT PIN
ON
V_DD
L
OFF _i
GND
OFF
ON i=0
V_DD
L
GND
X
O
In the left case, Tr. base current flows from port to GND.
To avoid power consumption, low output to the port .
Figure 20-4 Application example of Port under Power Consumption
Nov. 1999 Ver 1.0
PRELIMINARY
79