UPD17062 datasheet(104/298 Pages) RENESAS

104 / 298 page

102

µPD17062

10.5.6

Address Registers

The address registers are mapped to addresses 74H to 77H in the system register (at data memory addresses

74H to 7FH). They are used for program memory address operations. See Chapter 8.

The address registers can be used to manipulate data directly with data memory operation instructions.

They can also be used to transfer data via the data buffer as part of the peripheral hardware.

In other words, data can be read and written via the data buffer with PUT and GET instructions, as well as

data memory operation instructions.

Fig. 10-9 shows the relationship between the address registers and the data buffer.

Fig. 10-9

Relationship Between Address Registers and Data Buffer

DBF3

0CH

DBF2

0DH

DBF1

0EH

DBF0

0FH

b15 b14 b13 b12

b11 b10

40H

Address register data write and read

Address register

b15

b14 b13

b12

b11 b10

AR3

AR2

AR1

AR0

74H

75H

76H

77H

Name

Symbol

Address

Data

Address register

Symbol

Peripheral

address

Peripheral hardware

Peripheral register

Name

Data buffer

Symbol

Address

Bit

Data

Transfer data

GET

PUT

Valid data

Name

Address

The eight high-order bits of the address

registers are always 0.

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