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參數(shù)資料
| 型號(hào)： | 6P8A |
| 廠商： | NEC Corp. |
| 英文描述： | MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 馬鞍山集成電路4位單片機(jī)的紅外遙控傳輸 |
| 文件頁(yè)數(shù)： | 19/95頁(yè) |
| 文件大?。?/td> | 692K |
| 代理商： | 6P8A |
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19
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
4. PORT REGISTERS (PX)
The K
I/O
port, the K
I
port, the special ports (S
0
, S
1
/LED, S
2
), and the control registers are treated as port registers.
After reset, the port register values are as shown below.
Figure 4-1. Port Register Configuration
Notes 1.
×
: Refers to the value based on the K
I
and S
2
pin state.
2.
×
: Refers to the value based on decrease of power supply voltage (0 when V
DD
≤
V
ID
)
Remark
V
ID
: RAM retention detection voltage
Table 4-1. Relationship Between Ports and Reading/Writing
Port Name
Input Mode
Output Mode
Read
Write
Read
Write
K
I/O
Pin state
Output latch
Output latch
Output latch
K
I
Pin state
—
—
—
S
0
Pin state
—
Note
—
S
1
/LED
Pin state
—
Pin state
—
S
2
Pin state
—
—
—
Note
When in OFF mode, “1” is always read.
Port register
P0
K
I/O7
P
00
After reset
FFH
K
I/O6
K
I/O5
K
I/O4
K
I/O3
K
I/O2
K
I/O1
K
I/O0
P
10
P1
K
I3
P
01
××××
11
×
1B
Note 1
K
I2
K
I1
K
I0
S
1
/LED
S
0
S
2
1
P
11
P3 (control register 0)
DP
11
P
03
0000
×
000B
Note 2
DP
10
DP
9
DP
8
RAM
retention
flag
–
–
–
P
13
P4 (control register 1)
0
P
04
26H
0
K
I
Pull-down
S
0
/S
1
Pull-down
S
2
STOP release
S
1
/LED mode
K
I/O
mode
S
0
mode
P
14
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