Intel 8XC196MH, 8XC196MD RUN-TIME Programming, Pccb and Uprom Programming Values, PMODE30 0DH

8XC196MC, MD, MH USER’S MANUAL

Table 16-13. PCCB and UPROM Programming Values

Pins	PCCB Programming	UPROM Programming
PMODE3:0	0DH	09H
P4.7:0	FFH	FFH
P3.7:0	Data to be programmed in PCCB	Value to program UPROM bits:
	(See CCR descriptions in Appendix C)	04H to program DED only
		08H to program DEI only
		0CH to program both DED and DEI

Assert PALE# to begin programming. The algorithm sends five programming pulses that write the port 3 data to the OTPROM, then it compares the input data with the programmed data. If the programming verifies, the PVER signal lights the LED to indicate successful programming. Oth- erwise, you can pulse PALE# to repeat programming. Complete the procedure by following the power-down sequence (page 16-14).

NOTE

The PCCB and UPROM programming modes are available only for the 8XC196MH device. The pulse width is 200 µs at 8 MHz or 266 µs at 6 MHz.

16.11 RUN-TIME PROGRAMMING

You can program an OTPROM location during normal code execution. To make the OTPROM array accessible, apply VCC voltage to EA# while you reset the device. Apply VPP voltage to the VPP pin during the entire programming process. Then simply write to the location to be pro- grammed.

NOTE

Programming either security-lock bit in CCB0 disables run-time programming. (For details, see “Controlling Access to the OTPROM During Normal Operation” on page 16-4.)

Immediately after writing to the OTPROM, the device must either enter idle mode or execute code from external memory. An access to OTPROM would abort the current programming cycle. Each programming cycle begins when a word is written to the OTPROM and ends when the next OTPROM access occurs. Each word requires a total of five programming cycles, each of which must be approximately 100 μs in duration.

Figure 16-15 is a run-time programming example. It performs five programming cycles for each word. After each programming cycle, the code causes the device to enter idle mode.

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