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D78054 Datasheet(PDF) 11 Page - NEC

Part # D78054
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

D78054 Datasheet(HTML) 11 Page - NEC

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11
µPD78001B(A), 78002B(A)
A8 to A15
RD
WR
WAIT
ASTB
Input/
output
Port 5
8-bit input/output port.
LED can be driven directly.
Input/output can be specified bit-wise.
When used as an input port, pull-up resistor can be used by software.
P50 to P57
P60
P61
P62
P63
P64
P65
P66
P67
Input/
output
Port 6
8-bit input/output port.
Input/output can be specified
bit-wise.
When used as an input port, pull-up
resistor can be used by software.
N-ch open-drain input/output port. On-
chip pull-up resistor can be specified by
mask option.
LED can be driven directly.
Pin Name
I/O
Function
After
Reset
3.1
PORT PINS (2/2)
Dual-
Function Pin
Input
Input
Caution
When pull-up resistors are not used (specified by mask option), the low-level input leak current
increases with -200
µA (MAX.) under either of the following conditions.
1 When the external device expansion function is used and a low-level is input to the pin.
2 During the 3-clock period when a read instruction is executed on port 6 (P6) and the port mode
register (PM6).


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