SAB-C501G-1E24N SIEMENS [Siemens Semiconductor Group], SAB-C501G-1E24N Datasheet - Page 25

• Manufacturer Part Number: SAB-C501G-1E24N
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

OTP Operation
The C501-1E is programmed by usng a modified Quick-Pulse Programming
from older methods in the value used for V
number of the ALE/PROG pulses. The C501-1E contains two signature bytes that can be read and
used by a programming system to identify the device. The signature bytes identify the manufacturer
of the device.
Table 11 shows the logic levels for reading the signature byte, and for programming the program
memory, the encryption table, and the security bits. The circuit configuration and waveforms for
quick-pulse programming are shown in figures 10 to 12.
Table 11
OTP Programming Modes
Mode
Read signature
Program code data
Verify code data
Progam encryption table
Program security bit 1
Program security bit 2
Notes :
1. “0” = valid low for that pin, “1” = valid high for that pin.
2. V
3. V
4. ALE/PROG receives 25 programming pulses while V
1)
Semiconductor Group
100 s ( 10 s) and high for a minimum of 10 s.
Quick-Pulse Programming
PP
CC
= 12.75 V
= 5 V
10% during programming and verification.
0.25V
TM
RESET
is a trademark phrase of Intel Corporation
1
1
1
1
1
1
PSEN
0
0
0
0
0
0
PP
PROG
(programming supply voltage) and in the width and
ALE/
25
1
0
1
0
0
0
PP
is held at 12.75 V. Each programming pulse is low for
EA/V
V
V
V
V
1
1
PP
PP
PP
PP
PP
P2.7
0
1
0
1
1
1
P2.6
TM 1)
0
0
0
0
1
1
algorithm. It differs
P3.7
0
1
1
1
1
0
1997-04-01
P3.6
C501
0
1
1
0
1
0