C508_01 Datasheet, PDF (253/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
OTP Memory Operation
10.4
Programming Mode Selection
The selection for the OTP programming mode can be separated into two different parts:
– Basic programming mode selection
– Access mode selection
With 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 10-4.
V_DD
Clock
(XTAL1/
XTAL2)
RESET
PSEN
PMSEL1,0
PROG
PRD
PSEL
PALE
0,1
"0"
Stable
"1"
"0"
"1"
"0"
EA/V_PP
0V
During this period signals
are not actively driven
Figure 10-4 Basic Programming Mode Selection
5V
V_PP
V_IH2
Ready for access
mode selection
MCD04093
User’s Manual
10-7
2001-05