Rainbow-electronics AT88SA100S Manuel d'utilisateur télécharger pdf (Page 14)

14 AT88SA100S [Preliminary]

8558A–SMEM–03/09

4.2. Read

Reads 4 bytes from Fuse, ROM or MemValid. Any attempt to present the chip with an illegal Fuse address will result in

an error return.

Table 10. Input Parameters

Name Size Notes

Opcode READ 1 0x02

Param1 Mode 1 Fuse, ROM or MemValid. Refer to 1.1.

Param2 Address 2

Which 4 bytes within array. Bits 2-15 are ignored by the chip

and should be 0’s.

Data – 0

Table 11. Output Parameters

Name Size Notes

Contents 4 The contents of the specified memory location.

Table 12. Mode Encoding

Name Value Notes

ROM 0x00 Reads four bytes from the ROM. Bit 1 of the address parameter must be 0.

Fuse 0x01 Reads the value of 32 fuses. Bit 1 of the address parameter must be 1. The

LSB of the first byte returned contains the fuse numbered address<<5, and

so on.

MemValid 0x03 Returns four bytes. The LSB of the first byte indicates whether or not the

contents of the SRAM are valid. All other bits in all bytes have a value of 0.

The address parameter is ignored.

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Rainbow-electronics AT88SA100S Manuel d'utilisateur Page 14