Reading The Signature Word And Programming Voltages; Slave Programming Circuit And Memory Map - Intel 8XC196K Series User Manual

Table of Contents

8XC196K x , J x , CA USER'S MANUAL

16.8.1 Reading the Signature Word and Programming Voltages

The signature word identifies the device; the programming voltages specify the V

ages required for programming. This information resides in the test ROM at locations 2070H,

2072H, and 2073H; however, these locations are remapped to 007xH. You can use the dump word

command in slave programming mode to read the signature word and programming voltages at

the locations shown in Table 16-8. The external programmer can use this information to deter-

mine the device type and operating conditions. You should never write to these locations. The

voltages are calculated by using the following equation (after converting the test ROM value to

20 test ROM value

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Table 16-8. Device Signature Word and Programming Voltages

8XC196KR, JR, KQ, JQ – C step

8XC196JR, JQ – D step

8XC196KT, KS

Figure 16-5 shows the circuit diagram and Table 16-9 shows the memory map for slave program-

ming mode. The external clock signal can be supplied by either a clock or a crystal. Refer to the

device datasheet for acceptable clock frequencies.

Signature Word

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Programming V

Programming V