C515C_9711 Datasheet, PDF (234/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

OTP Memory Operation
C515C-8E
Table 10-1
Pin Definitions and Functions in Programming Mode (cont’d)
Symbol Pin Number I/O*) Function
PSEN
47
I
Program store enable
This input must be at static “0“ level during the whole
programming mode.
PROG 48
I
Programming mode write strobe
This input is used in programming mode as a write strobe for
OTP memory program and lock bit write operations. During
basic programming mode selection a low level must be applied
to PROG.
EA/V_PP
49
D0 - 7
52 - 58
I
External Access / Programming voltage
This pin must be at 11.5 V (V_PP) voltage level during
programming of an OTP memory byte or lock bit. During an
OTP memory read operation this pin must be at high level (V_IH).
This pin is also used for basic programming mode selection. At
basic programming mode selection a low level must be applied
to EA/V_PP.
I/O Data lines 0-7
During programming mode, data bytes are read or written from
or to the C515C-8E via the bidirectional D0-7 which are located
at port 0.
V_SS
13, 34, 35, – Circuit ground potential
51, 70
must be applied to these pins in programming mode.
V_CC
14, 32, 33, – Power supply terminal
50, 69
must be applied to these pins in programming mode.
N.C.
2-12, 20-31, –
46, 60-67, 69,
71-80
Not Connected
These pins should not be connected in programming mode.
*) I = Input
O = Output
Semiconductor Group
10-4
1997-11-01