RE46C180S16TF【PDF 36/58 页】IC ION SMOKE DETECT ASIC 16SOIC

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RE46C180

DS22275A-page 36

?2011 Microchip Technology Inc.

4.9

User Lock Bit Programming

Test mode TM19 allows users to program the user

EE lock bit. Once the user EE lock bit is set, the pro-

grammed user EE data can not be changed unless the

lock bit is reset.

To enter this mode, follow these steps:

1. Power up with the bias condition shown in

Figure 4-1 to enter M0. At power-up:

TEST = IO = FEED = T2 = V

DETECT = V

2. Drive T2 input from V

to V

and hold at V

to enter TM0.

3. Drive TEST from V

to V

and hold at V

4. Apply 19 clock pulses to the T2 input (V

and then back to V

) to enter in TM19

mode.

5. Hold TEST at V

and pulse IO once to set the

lock bit and store into the EEPROM memory.

6. To reset the lock bit from Step 5, drive TEST to

and pulse IO once.

FIGURE 4-9:

Timing Diagram for User Lock Bit Programming in Mode TM19

rEE l k i

VDD

TEST

VSS

VDD

VSS

Min TSETUP1 = 1

in TPW1 = 1

Min T1 = 20 祍

Min PW2 = 10 ms

VDD

VSS

MODE

TM0

TM1

TM2

TM3

TM4

TM5

TM6

TM19

To reset user EE lock bit

VDD

TEST

VSS

VDD

VSS

Min TSETUP1 = 1

in TPW1 = 1

Min T1 = 20 祍

Min PW2 = 10 ms

VDD

VSS

MODE

TM0

TM1

TM2

TM3

TM4

TM5

TM6

TM19

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