HCSXXX

DS41256A-page 24

Preliminary

 2004 Microchip Technology Inc.

5.7

Programming Waveforms (HCS410, HCS412)

FIGURE 5-7:

PROGRAMMING WAVEFORMS

FIGURE 5-8:

VERIFY WAVEFORMS

PWM

Enter Program

Mode

(Data)

(Clock)

bit 0

bit 1

bit 2

bit 3

bit 14 bit 15

bit 16 bit 17

Repeat for each word (18 times)

S2

Data for Word 0 (KEY_0)

Data for Word 1 (KEY_1)

Ack

Pulse

Note

1:

Unused button inputs to be held to ground during the entire programming sequence.

2:

PWM

(Clock)

(Data)

Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.

End of Programming Cycle

Beginning of Verify Cycle

bit 1 bit 2 bit 3

bit 15

bit 14

bit 16 bit 17

bit 206 bit 207

Data from Word 0

S2 (S3)

bit 0

bit 207

bit 206