VS1103B datasheet(58/61 Pages) ETC2

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VS1103b

VS1103B

8. VS1103B REGISTERS

8.13.9 UserCodec, 0x0

Normally contains the following VS DSP assembly code:

nop

If the user wants to take control away from the standard decoder, the ﬁrst instruction should be replaced

with an appropriate j command to user’s own code.

The system usually activates the user program in less than 1 ms. After this, the user should steal interrupt

vectors from the system, and insert user programs.

8.14 System Vector Functions

The System Vector Functions are pointers to some functions that the user may call to help implementing

his own applications.

8.14.1 WriteIRam(), 0x2

VS DSP C prototype:

void WriteIRam(register i0 u int16 *addr, register a1 u int16 msW, register a0 u int16 lsW);

This is the preferred way to write to the User Instruction RAM.

8.14.2 ReadIRam(), 0x4

VS DSP C prototype:

u int32 ReadIRam(register i0 u int16 *addr);

This is the preferred way to read from the User Instruction RAM.

A1 contains the MSBs and a0 the LSBs of the result.

8.14.3 DataBytes(), 0x6

VS DSP C prototype:

u int16 DataBytes(void);

Version 1.01, 2007-09-03

VS1103B Fiches technique(PDF) 58 Page - List of Unclassifed Manufacturers