GMS97C2051 Datasheet, PDF (12/39 Pages) Hynix Semiconductor – 8-Bit CMOS Microcontorller

GMS97C2051/L2051
Lock Bit Protection Modes
Program Lock Bits
LB1 LB2
Protection Type
1U
2P
3P
U
No program lock features.
Further programming of the
U
EPROM is disabled.
Same as mode 2, also verify
P
is disabled.
8-Bit CMOS Microcontroller
Reading the Signature Bytes :
The signature bytes are read by the same procedure as a
normal verification of locations 000H and 001H, except
that P3.5 and P3.7 need to be pulled to a logic low.
Manufacturer ID:
(00H) = E0H ( Indicates manufactured by HEI )
Device ID:
(01H) = 26H ( Indicates GMS97C2051/L2051 )
U : unprogrammed, P : programmed
EPROM Programming Modes
Table 10. EPROM Programming Modes
Mode
Read Signature
Program Code Data
Verify Code Data
Pgm encryption table
Pgm encryption bit1
Pgm encryption bit
RST
P3.2/ PROG
1
1
Vpp
1
1
Vpp
Vpp
Vpp
P3.3
0
0
0
0
1
1
P3.4
0
1
0
1
1
1
P3.5
0
1
1
0
1
0
P3.7
0
1
1
1
1
0
Notes:1. '0' = Valid low, '1' = Valid high for that
pin.
2. Vpp = 12.75 V
0.25 V
3. Vcc = 5 V
10 % during program-
ming
and verification.
4. P3.2/ PROG receives 10 programming pulses
while Vpp is held at 12.75V. Each program-
ming pulse is low for 100uS (
10uS)
and high for a minimum of 10uS.
HYUNDAI MicroElectronics
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