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UPD6P9 Datasheet(PDF) 14 Page - Renesas Technology Corp

Part # UPD6P9
Description  MOS INTEGRATED CIRCUIT
PDF  73 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD6P9 Datasheet(HTML) 14 Page - Renesas Technology Corp

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12
µPD67, 67A, 68, 68A, 69
Data Sheet U14935EJ2V1DS
2.6 Data Pointer (DP): 12 Bits
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
to 7 of the P3 register (CR0).
After reset, the pointer contents become 000H.
Figure 2-5. Data Pointer Configuration
Note Set DP10 and DP11 to 0 in the case of the
µPD67 and 67A, and set DP10 to 0 in the case of the µPD68
and 68A.
2.7 Accumulator (A): 4 Bits
The accumulator, which refers to a register consisting of 4 bits, plays a leading role in performing various
operations.
After reset, the accumulator contents are left undefined.
Figure 2-6. Accumulator Configuration
A3
A2
A1
A0
A
2.8 Arithmetic and Logic Unit (ALU): 4 Bits
The arithmetic and logic unit (ALU), which refers to an arithmetic circuit consisting of 4 bits, executes simple
(mainly logical) operations.
R00
DP9
DP8
DP7
DP6
DP5
DP4
DP3
DP2
DP1
DP0
R10
R0
b4
b5
P3 register
P3
DP10
Note
b6
DP11
Note
b7



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