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UPD63 Datasheet(PDF) 14 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) 14 Page - NEC

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µPD63, 63A, 64
3. PORT REGISTERS (PX)
The KI/O port, the KI port, the special ports (S0, S1/LED), and the control register are treated as port registers.
At reset, port register values are shown below.
Figure 3-1. Port Register Organization
Note
×: Refers to the value based on the KI pin state.
Table 3-1. Relationship between Ports and their Read/Write
Port Name
INPUT Mode
OUTPUT Mode
Read
Write
Read
Write
KI/O
Pin state
Output latch
Output latch
Output latch
KI
Pin state
—
—
—
S0
Pin state
—
Note
—
S1/LED
Pin state
—
Pin state
—
Note When in OFF mode, “1” is normally read.
Port Register
P0
KI/O7
P00
At Reset
FFH
KI/O6
KI/O5
KI/O4
KI/O3
KI/O2
KI/O1
KI/O0
P10
P1
KI3
P01
× FHNote
KI2
KI1
KI0
S1/LED
S0
11
P11
P3 (Control register 0)
0
P03
03H
0DP9
DP8
TCTL
CARY
MOD1
MOD0
P13
P4 (Control register 1)
0
P04
26H
0
KI
pull-down
S0/S1
pull-down
0
S1/LED mode
KI/O mode
S0 mode
P14



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