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UPD75304BGC Datasheet(PDF) 10 Page - NEC

Part # UPD75304BGC
Description  4-BIT SINGLE-CHIP MICROCOMPUTER
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD75304BGC Datasheet(HTML) 10 Page - NEC

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10
µPD75304B,75306B,75308B
3.1
PORT PINS (2/2)
Dual-
Function Pin
KR0
KR1
KR2
KR3
KR4
KR5
KR6
KR7
S24
S25
S26
S27
S28
S29
S30
S31
*1.
: Schmitt trigger input
2. BP0 to BP7 select VLC1 as the input source.
However, the output level depends on BP0 to BP7 and VLC1 external circuit.
Example
BP0 to BP7 are connected mutually within the
µPD75308B. Therefore, the output level of BP0 to BP7
is determined by the value of R1, R2 and R3.
µPD75308B
ON
ON
VLC1
R1
R3
BP0
BP1
R2
VDD
Pin Name
P60
P61
P62
P63
P70
P71
P72
P73
BP0
BP1
BP2
BP3
BP4
BP5
BP6
BP7
Input/Output
Input/output
Input/output
Output
Output
Function
Programmable 4-bit input/output port (PORT 6)
Input/output can be specified bit-wise.
On-chip pull-up resistor can be specified as a
4-bit unit by software.
4-bit input/output port (PORT 7)
On-chip pull-up resistor can be specified as a
4-bit unit by software.
1-bit output port (BIT PORT)
Also used as segment output pin.
8-bit I/O
×
Input
Input
* 2
I/O Circuit
Type
*1
F - A
F - A
G - C
After
Reset


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