UPD62A NEC, UPD62A Datasheet - Page 11

• Manufacturer Part Number: UPD62A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

2.6 Data Pointer (DP): 10 Bits
bits 4 and 5 of the P3 register (CR0).
2.7 Accumulator (A): 4 Bits
The ROM data table can be referenced by setting the ROM address in the data pointer to call the ROM contents.
The low-order 8 bits of the ROM address are specified by R0 of the data memory; and the high-order 2 bits by
When reset, the pointer contents become “000H”.
The accumulator, which is a register consisting of 4 bits, plays a leading role in performing various operations.
When reset, the accumulator contents become undefined.
P3
DP
P3 register
b
5
9
DP
b
4
8
R
1n
(high-order 4 bits) R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
1A
1B
1C
1D
1E
10
11
12
13
14
15
16
17
18
19
1F
Figure 2-4. Data Memory Configuration
Figure 2-6. Accumulator Configuration
Figure 2-5. Data Pointer Configuration
DP
7
RA
RB
RC
RD
RE
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
RF
A
0n
3
(low-order 4 bits)
Data Sheet U14474EJ1V0DS00
DP
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
6
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
R
A
10
2
DP
5
A
DP (refer to 2.6 Data Pointer (DP))
ASR (refer to 2.3 Address Stack Register (ASR (RF)))
1
DP
4
A
0
DP
3
A
DP
2
R
00
DP
1
DP
0
R0
PD62A
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