PCF50732 datasheet(39/64 Pages) PHILIPS

39 / 64 page

1999 May 03

Philips Semiconductors

Objective speciﬁcation

Baseband and audio interface for GSM

PCF50732

13.3

Descriptions of the VSP instruction set

13.3.1

CONVENTIONS

In the descriptions of the VSP instruction set:

• A = the 30-bit accumulator

• I = the 6-bit index register

• r.a. = a 6-bit register address

• p.n. = a 3-bit port number (address)

• coeff = a 12-bit coefficient

• f.l. = a 3-bit flag descriptor

• addr = a 9-bit address

• stack = a one entry deep return address stack

• PC = a 9-bit program counter

• o.a. = the 9-bit old address

• s.i. = small integer

• X = don’t care during a read/or write access.

13.3.2

LDA INSTRUCTION

The LDA (Load accumulator) instruction is used to load data into the VSP’s accumulator. Flags affected are

EQ0 and EQ1.

Table 35 LDA instruction

13.3.3

STO INSTRUCTION

The STO (Store accumulator) instruction is used to store data into register RAM or output ports. No flags are affected.

Table 36 STO instruction

15 14 13 12 11 10 987654 3

OPERATION

ASSEMBLER

NAME

0001

coefﬁcient

coeff

→ A

LDA c <coeff> load coefﬁcient

0000

0 X X X

R(r.a.)

→ A

LDA r <r.a.>

load register

0000

1 X X X

R(r.a. + I)

→ A LDA i <r.a.>

load register indexed

0000

0 XXXXX X port number P(p.n.)

→ A

LDA p <p.n.>

load port

0000

small integer

s.i.

→ A

LDA s <s.i.>

load integer

0000

0 XXXXX X

→ A

LDA x

load index

15 14 13 12 11 10 9 8 7 6 5 4 3

OPERATION

ASSEMBLER

NAME

0 X X X

→ R(r.a.)

STO r <r.a.>

store register

1 X X X

→ R(r.a. + I) STO i <r.a.>

store register indexed

0 X X X X X X port number A

→ P(p.n.)

STO p <p.n.>

store port

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