N87C51RA1 Intel, N87C51RA1 Datasheet - Page 17

• 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

PROGRAMMING ALGORITHM
Refer to Table 4 and Figures 10 and 11 for address
data and control signals set up To program the
87C51RX the following sequence must be exer-
cised
1 Input the valid address on the address lines
2 Input the appropriate data byte on the data
3 Activate the correct combination of control sig-
4 Raise EA V
5 Pulse ALE PROG 5 times for the EPROM ar-
See Table 4 for proper input on these pins
lines
nals
ray and 25 times for the encryption table and
the lock bits
PP
from V
CC
to 12 75V
Figure 11 Programming Signal’s Waveforms
Figure 10 Programming the EPROM
g
0 25V
Repeat 1 through 5 changing the address and data
for the entire array or until the end of the object file is
reached
PROGRAM VERIFY
Program verify may be done after each byte or block
of bytes is programmed In either case a complete
verify of the programmed array will ensure reliable
programming of the 87C51RX
The lock bits cannot be directly verified Verification
of the lock bits is done by observing that their fea-
tures are enabled
272659 –19
8XC51RA RB RC
272659 –20
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