N87C51RA1 Intel, N87C51RA1 Datasheet - Page 16

• Manufacturer Part Number: N87C51RA1
• Description: IC MCU 8BIT 8K 16MHZ OTP 44-PLCC
• Manufacturer: Intel
• Series: 87Cr

Specifications of N87C51RA1

• Rohs Status: RoHS non-compliant
• Core Processor: MCS 51
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SIO
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Eeprom Size: -
• Data Converters: -
• Other names: 806959

8XC51RA RB RC
PROGRAMMING THE EPROM
The part must be running with a 4 MHz to 6 MHz
oscillator The address of an EPROM location to be
programmed is applied to address lines while the
code byte to be programmed in that location is ap-
plied to data lines Control and program signals must
be held at the levels indicated in Table 4 Normally
EA V
PROG is to be pulsed The EA V
ALE PROG is pulsed low and then EA V
turned to a high (also refer to timing diagrams)
16
Program Code Data
Verify Code Data
Program Encryption
Array Address 0– 3FH
Program Lock
Bits
Read Signature Byte
Exceeding the V
time could damage the device permanently The
V
glitches
PP
PP
source must be well regulated and free of
is held at logic high until just before ALE
Mode
PP
Bit 1
Bit 2
Bit 3
NOTES
maximum for any amount of
RST
H
H
H
H
H
H
H
PP
Table 4 EPROM Programming Modes
is raised to V
PSEN
L
L
L
L
L
L
L
PP
is re-
PROG
ALE
PP
H
H
DEFINITION OF TERMS
ADDRESS LINES P1 0 – P1 7 P2 0 – P2 5 respec-
tively for A0 – A13
DATA LINES P0 0 – P0 7 for D0 – D7
CONTROL SIGNALS RST PSEN P2 6 P2 7 P3 3
P3 6 P3 7
PROGRAM SIGNALS ALE PROG EA V
12 75V
12 75V
12 75V
12 75V
12 75V
EA
V
H
H
PP
P2 6
H
H
H
L
L
L
L
P2 7
H
H
H
H
L
L
L
P3 3
H
H
H
H
H
L
L
P3 6
H
H
H
H
L
L
L
PP
P3 7
H
H
H
H
L
L
L