upd6p9 Renesas Electronics Corporation., upd6p9 Datasheet - Page 14

• Manufacturer Part Number: upd6p9
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

3.6 Data Pointer (DP): 12 Bits
to 7 of the P3 register (CR0).
3.7 Accumulator (A): 4 Bits
operations.
3.8 Arithmetic and Logic Unit (ALU): 4 Bits
(mainly logical) operations.
14
The ROM data table can be referenced by setting the ROM address in the data pointer to call the ROM contents.
The lower 8 bits of the ROM address are specified by R0 of the data memory; and the higher 4 bits by bits 4
After reset, the pointer contents become 000H.
The accumulator, which refers to a register consisting of 4 bits, plays a leading role in performing various
After reset, the accumulator contents are left undefined.
The arithmetic and logic unit (ALU), which refers to an arithmetic circuit consisting of 4 bits, executes simple
P
3
DP
b
7
11
DP
P3 register
b
6
10
DP
b
5
9
DP
b
4
8
Figure 3-6. Accumulator Configuration
Figure 3-5. Data Pointer Configuration
A
3
DP
Data Sheet U15144EJ1V1DS
7
A
2
DP
6
R
A
10
1
DP
5
A
0
DP
4
A
DP
3
DP
2
R
00
DP
1
DP
0
R0
µ PD6P9