GMS97C2051 datasheet(12/39 Pages) HYNIX

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GMS97C2051/L2051

8-Bit CMOS Microcontroller

HYUNDAI MicroElectronics

Lock Bit Protection Modes

Program Lock Bits

LB1

LB2

Protection Type

No program lock features.

Further programming of the

EPROM is disabled.

Same as mode 2, also verify

is disabled.

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

RST

P3.2/ PROG

P3.3

P3.4

P3.5

P3.7

Read Signature

Program Code Data

Vpp

Verify Code Data

Pgm encryption table

Vpp

Pgm encryption bit1

Vpp

Pgm encryption bit

Vpp

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.

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