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UPD63 Datasheet(PDF) 18 Page - NEC

Part # UPD63
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
PDF  68 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD63 Datasheet(HTML) 18 Page - NEC

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µPD63, 63A, 64
3.4 Control Register 1 (P4)
Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.
When reset, the register becomes 0010 0110B.
Table 3-6. Control Register 1 (P4)
Bit
b7
b6
b5
b4
b3
b2
b1
b0
Name
—
—
KI
S0/S1
—S1/LED
KI/O
S0
Pull-down Pull-down
mode
mode
mode
Set
0
Fixed
Fixed
OFF
OFF
Fixed
S1
IN
OFF
value
1
to “0”
to “0”
ON
ON
to “0”
LED
OUT
IN
When reset
00100110
b0
: Specifies the input mode of the S0 port. “0” = OFF mode (high impedance); “1” = IN (INPUT mode).
b1
: Specifies the I/O mode of the KI/O port.
“0” = IN (INPUT mode); “1” = OUT (OUTPUT mode).
b2
: Specifies the I/O mode of the S1/LED port. “0” = S1 (INPUT mode); “1” = LED (output mode).
b4
: Specifies the availability of the pull-down resistor in S0/S1 port INPUT mode. “0” = OFF (unavailable);
“1” = ON (available)
b5
: Specifies the availability of the pull-down resistor in KI port. “0” = OFF (unavailable);
“1” = ON (available).
Remark In OUTPUT mode or in OFF mode, all the pull-down resistors are automatically disconnected.



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