Intel 8XC196MC, 8XC196MD manual Auto Programming Routine, 11 XC196MC/MD Auto Programming Memory Map

PROGRAMMING THE NONVOLATILE MEMORY

Table 16-11. 8XC196MC/MD Auto Programming Memory Map

Address	Internal	Address Using
Output from		Circuit in
	OTPROM		Description
8XC196MC,		Figure 16-12
	Address
8XC196MD		(A15:0)
4014H	N/A	14H	Programming pulse width (PPW) LSB.
4015H	N/A	15H	Programming pulse width (PPW) MSB.
4020–402FH	2020–202FH	0020–002FH	Security key for verification.
4000–7FFFH	2000–5FFFH	4000–7FFFH	Code, data, and reserved locations.

Table 16-12. 8XC196MH Auto Programming Memory Map

Address	Internal	Address Using
		Circuit in
Output from	OTPROM		Description
		Figure 16-12
8XC196MH	Address
		(P1.3:0, A11:0)
105EH	N/A	105EH	Programming pulse width (PPW) LSB.
105FH	N/A	105FH	Programming pulse width (PPW) MSB.
0020–002FH	2020–202FH	0020–002FH	Security key for verification.
2000–9FFFH	2000–9FFFH	2000–9FFFH	Code, data, and reserved locations.

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 16-18). 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.

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.

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