Operating Environment; Auto Programming Routine - Intel 8XC196K Series User Manual

8XC196K x , J x , CA USER'S MANUAL
Address
Output from Internal
8XC196 OTPROM
Device Address
(A15:0)
4014H
4015H
4020–402FH
4000–6FFFH
4000–7FFFH
4000–7FFFH
4000–7FFFH
A000–FFFEH
8000–DFFEH

16.9.2 Operating Environment

In the auto programming mode, the PCCBs are loaded into the chip configuration registers. Since
the device gets programming data through the external bus, the memory device in the program-
ming system must correspond to the default configuration (Figure 16-6 on page 16-19). Auto pro-
gramming requires an 8-bit bus configuration, so the circuit must tie the BUSWIDTH pin low.
The PCCB defaults allow you to use any standard EPROM that satisfies the AC specifications
listed in the device datasheet.
The auto programming mode also loads CCB0 into an internal RAM location and checks the lock
bits. If either lock bit is programmed, the auto programming routine compares the internal secu-
rity key to the external security key location. If the verification fails, the device enters an endless
internal loop. If the security keys match, the routine continues. The auto programming routine
uses the modified quick-pulse algorithm and the pulse width value programmed into the external
EPROM (locations 14H and 15H).

16.9.3 Auto Programming Routine

Figure 16-13 illustrates the auto programming routine. This routine checks the security lock bits
in CCB0; if either bit is programmed, it compares the internal security key to the external security
key locations. If the security keys match, the routine continues; otherwise, the device enters an
endless loop.
16-28
Table 16-11. Auto Programming Memory Map
Address
Using Circuit
in Figure
16-12
(P1.2:1, A13:0)
N/A
N/A
2020–202FH 0020–002FH Security key for verification.
2000–4FFFH 4000–6FFFH Code, data, and reserved locations. (KQ, JQ)
2000–5FFFH 4000–7FFFH Code, data, and reserved locations. (KR, JR)
2000–7FFFH 4000–9FFFH Code, data, and reserved locations. (KS)
2000–9FFFH 4000–BFFFH Code, data, and reserved locations. (KT, JT, CA)
2000–7FFEH 2000–4FFFH
8000–DFFEH 5000–7FFFH
Description
14H Programming pulse width (PPW) LSB.
15H Programming pulse width (PPW) MSB.
Code, data, and reserved locations. (JV)