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| C541U_99 Datasheet, PDF (176/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER | |||
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OTP Memory Operation
C541U
10.4 Programming Mode Selection
The selection for the OTP programming mode can be separated into two different parts :
â Basic programming mode selection
â Access mode selection
With the basic programming mode selection the device is put into the mode in which it is possible
to access the OTP memory through the programming interface logic. Further, after selection of the
basic programming mode, OTP memory accesses are executed by using one of the access modes.
These access modes are OTP memory byte program/read, version byte read, and program/read
lock byte operations.
10.4.1 Basic Programming Mode Selection
The basic programming mode selection scheme is shown in figure 10-3.
V CC
Clock
(XTAL1 / XTAL2)
RESET
PSEN
PMSEL1,0
PROG
PRD
PSEL
PALE
0,1
"0"
Stable
"1"
"0"
"1"
"0"
EA / VPP
During this period signals
are not actively driven
Figure 10-3
Basic Programming Mode Selection
Semiconductor Group
0V
10-5
5V
V PP
V IH1
Ready for access
mode selection
MCT03389
1997-10-01
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