Siemens EF 88H Series Manual de usuario descargar pdf (Pagina 97)

OTP Memory Operation

C501

Semiconductor Group 9-4

9.5 OTP Memory Verification

If security bit 2 has not been programmed, the on-chip OTP program memory can be read out for

program verification. The address of the OTP program memory locations to be read is applied to

ports 1 and 2 as shown in figure 9-30. The other pins are held at the “Verify code data“ levels

indicated in table 9-11. The contents of the address location will be emitted on port 0. External

pullups are required on port 0 for this operation.

Figure 9-30

C501-1E OTP Memory Verification

If the encryption table has been programmed, the data presented at port 0 will be the exclusive NOR

of the program byte with one of the encryption bytes. The user will have to know the encryption table

contents in order to correctly decode the verification data. The encryption table itself cannot be read

out.

Reading the SIgnature Bytes

The signature bytes are read by the same procedure as a normal verification of locations 30

and

, except that P3.6 and P3.7 need to be pulled to a logic low level. The values of the signature

bytes are :

Address 30

: E0

indicates manufacturer

Address 31

: 71

indicates C501-1E

MCS03235

Port 1

RESET

P3.6

P3.7

XTAL2

XTAL1

Port 0

EA/

ALE/PROG

PSEN

P2.7

P2.6

P2.0 - P2.4

10 k Ω

Programming

Data

Enable

A8 - A12

A0 - A7

4 - 6 MHz

C501-1E

+5 V

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 120 121

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Siemens EF 88H Series Manual de usuario Pagina 97

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