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Semiconductor Group 9-1

OTP Memory Operation

C501

9 OTP Memory Operation of the C501-1E

The C501-1E is the OTP version of the C501-1R ROM version microcontroller. Its functionality is

fully compatible with the C501-1R functionality. This chapter describes in detail the programming

features of the C501-1E.

9.1 Programming Modes

The C501-1E is programmed by usng a modified Quick-Pulse Programming

TM 1)

algorithm. It differs

from older methods in the value used for V

(programming supply voltage) and in the width and

number of the ALE/PROG

pulses. The C501-1E contains two signature bytes that can be read and

used by a programming system to identify the device. The signature bytes identify the manufacturer

and the type of the device.

Table 9-11 shows the logic levels for reading the signature byte, and for programming the program

memory, the encryption table, and the security bits.

Notes :

1. “0” = valid low for that pin, “1” = valid high for that pin.

2. V

= 12.75 V ± 0.25V

3. V

= 5 V ± 10% during programming and verification.

4. ALE/PROG

receives 25 programming pulses while V

is held at 12.75 V. Each programming pulse is low for

100 µs (±

10 µs) and high for a minimum of 10 µs.

Quick-Pulse Programming

is a trademark phrase of Intel Corporation

Table 9-11

OTP Programming Modes

Mode RESET PSEN

ALE/

PROG

EA/V

P2.7 P2.6 P3.7 P3.6

Read signature 1 0 1 1 0000

Program code data 1 0 0 V

1011

Verify code data 1 0 1 1 0011

Progam encryption table 1 0 0 V

1010

Program security bit 1 1 0 0 V

1111

Program security bit 2 1 0 0 V

1100

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 120 121

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