PCF50732H datasheet(42/64 Pages) PHILIPS

42 / 64 page

1999 May 03

Philips Semiconductors

Objective speciﬁcation

Baseband and audio interface for GSM

PCF50732

13.3.12 STF INSTRUCTION

The STF (Set/clear flag) instruction is used to set or clear the user flags A, B or C. System flags cannot be set or reset

under program control.

Table 45 STF instruction

13.3.13 IDX INSTRUCTION

The IDX (Index operations) instruction is used to store and increment/decrement index values. It should be noted that

additions to the index register is done in modulo 64. A ‘decrement index register by one’ could therefore be programmed

as ‘IDX + 63’. The ‘IDX A’ instruction loads the 6 bits to the left of the binary point into the index register, i.e. it stores the

integer part modulo 64 into I.

Table 46 IDX instruction

13.4

The assembler/emulator

A 2-pass assembler and an emulator was made to assist with the development of VSP programs. The software programs

are written in ‘C’ and currently run under NT, HPUX and LINUX operating systems. The assembler reads assembler

source files and produces a log file, sets of VHDL or Verilog stimuli and an output file containing CSI instructions that,

when loaded, will load the executable into the VSP RAM.

Requirements for the assembler source code are:

• One instruction or pseudo instruction (see Table 47) per line

• No empty lines

• A maximum of 512 instructions

• Operation always starts at instruction 0.

Table 47 Assembler pseudo instructions

987654321

OPERATION

ASSEMBLER

ﬂag

XXXXXXXX

value

<value>

→ <f.l.> STF <f.l.> <value>

9876543210

OPERATION

ASSEMBLER

value

<value>

→ I

IDX = <value>

value

I + <value>

→ I

IDX + <value>

XXXXXXXXX A

→ I

IDX A

MNEMONIC

INSTRUCTION

DEFINITION

. label

{<.>< ><label>}

Deﬁnes a location inside the source code. Is usually used as

an argument to JMF/JSF instructions.

deﬁne

{<deﬁne>< ><label> < ><value>

Deﬁnes a variable and assigns a value to it. These variables

can then be referenced in the assembler instructions.

include

{<include>< ><ﬁle name>}

Reads in another source code ﬁle and then continues with the

current ﬁle.

{<-->< ><comment>

Deﬁnes a comment; the rest of the line is skipped.

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