HCSXXX Datasheet, PDF (24/28 Pages) Microchip Technology – Memory Programming Specification

HCSXXX
5.7 Programming Waveforms (HCS410, HCS412)
FIGURE 5-7:
PROGRAMMING WAVEFORMS
S2
(Clock)
PWM
(Data)
Enter Program
Mode
TPS TPH1
TPBW
TCLKH
TDS
TCLKL
TDH
bit 0 bit 1 bit 2 bit 3
TAS
TWC
bit 14 bit 15
TPH2
Data for Word 0 (KEY_0)
Repeat for each word (18 times)
Note 1: Unused button inputs to be held to ground during the entire programming sequence.
2: The VDD pin must be taken to ground after a Program/Verify cycle.
bit 16 bit 17
Data for Word 1 (KEY_1)
Ack
Pulse
FIGURE 5-8:
VERIFY WAVEFORMS
End of Programming Cycle
Beginning of Verify Cycle
TWC
S2 (S3)
(Clock)
PWM
(Data)
bit 206 bit 207
Data from Word 0
bit 0
bit 1 bit 2 bit 3
TDV
bit 14
bit 15
bit 16 bit 17
bit 206 bit 207
Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.
DS41256A-page 24
Preliminary
 2004 Microchip Technology Inc.