GMS90C3X Datasheet, PDF (51/59 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS90 Series
EPROM CHARACTERISTICS
The GMS97C5X, 97L5X are programmed by using a modified Quick-Pulse Programming^TM algorithm. It dif-
fers from older methods in the value used for V_PP (programming supply voltage) and in the width and number
of the ALE/PROG pulses. The GMS97C5X, 97L5X contains two signature bytes that can be read and used by
an EPROM programming system to identify the device. The signature bytes identify the device as an manufac-
tured by HME. 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 Figure 12 and Figure 13. Figure 14 show the circuit configuration for normal pro-
gram memory verification.
Reading the Signature Bytes :
The GMS97X51/52 signature bytes in locations 030_H and 031_H, the GMS97X54/56/58 signature bytes in loca-
tions 05E_H and 07C_H. To read these bytes follow the procedure for EPROM verify, except that P3.6 and P3.7
need to be pulled to a logic low.
The values are:
Device
GMS97X51
GMS97X52
GMS97X54
GMS97X56
GMS97X58
Location
30_H
31_H
30_H
31_H
5E_H
7C_H
5E_H
7C_H
5E_H
7C_H
Contents
E0_H
73_H
E0_H
71_H
E0_H
54_H
E0_H
56_H
E0_H
58_H
Remarks
Manufacturer ID
Device ID
Manufacturer ID
Device ID
Manufacturer ID
Device ID
Manufacturer ID
Device ID
Manufacturer ID
Device ID
Quick-pulse programming
The setup for microcontroller quick-pulse programming is shown in Figure 13. Note that the GMS97C5X,
97L5X is running with a 4 to 6MHz oscillator. The reason the oscillator needs to be running is that the device
is executing internal address and program data transfers.
The address of the EPROM location to be programmed is applied to ports 1 and 2, as shown in Figure 12. The
code byte to be programmed into that location is applied to port 0, RST, PSEN and pins of port 2 and 3 in Table
11 are held at the "Program Code Data" levels indicated in Table 11. The ALE/PROG is pulsed low 25 times(10
times for 97X54/56/58) as shown Figure 13.
To program the encryption table, repeat the 25 pulses (10 pulses for 97X54/56/58) programming sequence for
addresses 0 through 1F_H(3F_H for 97X54/56/58), using the "Program Encryption Table" levels. Do not forget
that after the encryption table is programmed, verification cycles will produce only encrypted data.
To program the security bits, repeat the 25 pulses (10 pulses for 97X54/56/58) programming sequence using the
"Pgm Security Bit" levels after one security bit is programmed, further programming of the code memory and
Oct. 2000 Ver 3.1a
47