CP8056 データシートの表示（PDF） - Unspecified

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CP8056

EPROM/ROM-Based 8-Bit Microcontroller Series

Unspecified 

CHENGPIN

2.0 FUNCTIONAL DESCRIPTIONS

2.1 Operational Registers

CP8056

2.1.1 INDF (Indirect Addressing Register)

Address

00h (r/w)

Name

INDF

B7

B6

B5

B4

B3

B2

B1

B0

Uses contents of FSR to address data memory (not a physical register)

The INDF Register is not a physical register. Any instruction accessing the INDF register can actually access the

register pointed by FSR Register. Reading the INDF register itself indirectly (FSR=”0”) will read 00h. Writing to the

INDF register indirectly results in a no-operation (although status bits may be affected).

The bits 5-0 of FSR register are used to select up to 64 registers (address: 00h ~ 3Fh).

EXAMPLE 2.1: INDIRECT ADDRESSING

• Register file 38 contains the value 10h

• Register file 39 contains the value 0Ah

• Load the value 38 into the FSR Register

• A read of the INDF Register will return the value of 10h

• Increment the value of the FSR Register by one (@FSR=39h)

• A read of the INDR register now will return the value of 0Ah.

FIGURE 2.1: Direct/Indirect Addressing

Direct Addressing

5 from opcode 0

Indirect Addressing

5 from FSR register 0

location select

00h

location select

addressing INDF register

3Fh

P.6/CP8056

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