HCSXXX Datasheet, PDF (21/28 Pages) Microchip Technology – Memory Programming Specification

HCSXXX
5.4 Programming Waveforms (HCS200, HCS300, HCS301, HCS320, HCS362)
FIGURE 5-1:
PROGRAMMING WAVEFORMS
Enter Program
Mode
TPBW
TCLKH
TDS
S2
(Clock)
PWM
(Data)
TPS TPH1
TCLKL
TDH
bit 0 bit 1 bit 2 bit 3
TAS
TWC
bit 14 bit 15
bit 16 bit 17
TPH2
Data for Word 0 (KEY_0)
Repeat for each word (12 times)
Note 1: Unused button inputs to be held to ground during the entire programming sequence.
Data for Word 1 (KEY_1)
Ack
Pulse
FIGURE 5-2:
VERIFY WAVEFORMS
End of Programming Cycle
TWC
S2 (S3)
(Clock)
PWM
(Data)
bit 190 bit 191
Beginning of Verify Cycle
Data from Word 0
bit 0
bit 1 bit 2 bit 3
TDV
bit 14 bit 15 bit 16 bit 17
bit 190 bit 191
Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.
 2004 Microchip Technology Inc.
Preliminary
DS41256A-page 21