UPD65 NEC [NEC], UPD65 Datasheet - Page 11

• Manufacturer Part Number: UPD65
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

2.6 Data Pointer (DP): 11 Bits
bits 4, 5, and 6 of the P3 register (CR0).
2.7 Accumulator (A): 4 Bits
operations.
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 3 bits by
When reset, the pointer contents become “000H”.
Note Set DP
The accumulator, which refers to a register consisting of 4 bits, plays a leading role in performing various
When reset, the accumulator contents are left undefined.
P3
DP
b
10
6
10
Note
of the PD64A to "0".
P3 Register
DP
b
5
9
R
1n
(high-order 4 bits) R
DP
b
4
8
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 Organization
Figure 2-6. Accumulator Organization
Figure 2-5. Data Pointer Organization
RA
RB
RC
RD
RE
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
RF
DP
A
0n
3
(low-order 4 bits)
7
Data Sheet U14380EJ2V0DS00
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
DP
A
2
6
R
10
DP
A
DP (refer to 2.6 Data Pointer (DP))
ASR (refer to 2.3 Address Stack Register (ASR (RF)))
1
5
DP
A
0
4
A
DP
3
DP
2
R
00
DP
1
DP
PD64A, 65
0
R0
11