C541U_99 Datasheet, PDF (179/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER

OTP Memory Operation
C541U
Figure 10-5 shows a waveform example of the program/read mode access for several OTP
memory bytes. In this example OTP memory locations 3FDH to 400H are programmed. Thereafter,
OTP memory locations 400H and 3FDH are read.
PMSEL1,0
PALE
Port 2
Port 0
PROG
PRD
1,1
3FD
03 FD
3FE
3FF
400
FE
FF 04 00
Data 1 Data 2 Data 3
Data 4
400
3FD
00 03 FD
Data 4
Data 1
MCT03420
Figure 10-5
Typical OTP Memory Programming/Verify Access Waveform
Semiconductor Group
10-8
1997-10-01