C515C_9711 Datasheet, PDF (231/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

OTP Memory Operation
C515C-8E
10 OTP Memory Operation (C515C-8E only)
The C515C-8E is the OTP version in the C515C microcontroller with a 64 Kbyte one-time
programmable (OTP) program memory. With the C515C-8E fast programming cycles are achieved
(1 byte in 100 µsec). Also several levels of OTP memory protection can be selected. The basic
functionality of the C515C-8E as microcontroller is identical to the C515C-8R (ROM part) or C515C-
L (romless part) functionality. Therefore, the programmable C515C-8E typically can be used for
prototype system design as a replacement for the ROM-based C515C-8R microcontroller.
10.1 Programming Configuration
During normal program execution the C515C-8E behaves like the C515C-8R/C515C-L. For
programming of the device, the C515C-8E must be put into the programming mode. This typically
is done not in-system but in a special programming hardware. In the programming mode the
C515C-8E operates as a slave device similar as an EPROM standalone memory device and must
be controlled with address/data information, control lines, and an external 11.5 V programming
voltage.
In the programming mode port 0 provides the bidirectional data lines and port 2 is used for the
multiplexed address inputs. The upper address information at port 2 is latched with the signal PALE.
For basic programming mode selection the inputs RESET, PSEN, EA/V_PP, ALE, PMSEL1/0, and
PSEL are used. Further, the inputs PMSEL1,0 are required to select the access types (e.g.
program/verify data, write lock bits, ....) in the programming mode. In programming mode V_CC/V_SS
and a clock signal at the XTAL pins must be applied to the C515C-8E. The 11.5 V external
programming voltage is input through the EA/V_PP pin.
Figure 10-1 shows the pins of the C515C-8E which are required for controlling of the OTP
programming mode.
V_CC
V_SS
A0-7
A8-A15
PALE
PMSEL0
PMSEL1
XTAL1
XTAL2
Port 2
Port 0
C515C-8E
MCP03651
Figure 10-1
C515C-8E Programming Mode Configuration
Semiconductor Group
10-1
P0-7
EA/V_PP
PROG
PRD
RESET
PSEN
PSEL
1997-11-01