P87C51FA-4N NXP Semiconductors, P87C51FA-4N Datasheet - Page 33

• Manufacturer Part Number: P87C51FA-4N
• Description: IC, 8BIT MCU, 80C51, 16MHZ, DIP-40
• Manufacturer: NXP Semiconductors

Specifications of P87C51FA-4N

• Controller Family/series: 80C51
• No. Of I/o's: 32
• Ram Memory Size: 256Byte
• Cpu Speed: 16MHz
• No. Of Timers: 4
• No. Of Pwm Channels: 5
• Core Size: 8 Bit
• Program Memory Size: 8KB
• Package: 40PDIP
• Device Core: 80C51
• Family Name: 87C
• Maximum Speed: 16 MHz
• Ram Size: 256 Byte
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 32
• Interface Type: UART
• Operating Temperature: 0 to 70 °C
• Number Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
Philips Semiconductors
MASK ROM DEVICES
Security Bits
With none of the security bits programmed the code in the program
memory can be verified. If the encryption table is programmed, the
code will be encrypted when verified. When only security bit 1 (see
Table 10) is programmed, MOVC instructions executed from
external program memory are disabled from fetching code bytes
Table 10. Program Security Bits
NOTES:
ROM CODE SUBMISSION
When submitting ROM code for the 80C51, the following must be specified:
1. 4k byte user ROM data
2. 64 byte ROM encryption key
3. ROM security bits.
Security Bit 1: When programmed, this bit has two effects on masked ROM parts:
1. External MOVC is disabled, and
2. EA is latched on Reset.
Security Bit 2: When programmed, this bit inhibits Verify User ROM.
NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.
If the ROM Code file does not include the options, the following information must be included with the ROM code.
For each of the following, check the appropriate box, and send to Philips along with the code:
2000 Jan 20
PROGRAM LOCK BITS
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33 MHz)
ADDRESS
0000H to 0FFFH
1000H to 103FH
1040H
1040H
Security Bit #1:
Security Bit #2:
Encryption:
1
2
SB1
U
P
SB2
U
U
1, 2
Enabled
Enabled
No
PROTECTION DESCRIPTION
No Program Security features enabled.
(Code verify will still be encrypted by the Encryption Array if programmed.)
MOVC instructions executed from external program memory are disabled from fetching code bytes from
internal memory, EA is sampled and latched on Reset, and further programming of the EPROM is disabled.
CONTENT
DATA
KEY
SEC
SEC
Disabled
Disabled
Yes
If Yes, must send key file.
Back
33
BIT(S)
7:0
7:0
0
1
from the internal memory, EA is latched on Reset and all further
programming of the EPROM is disabled. When security bits 1 and 2
are programmed, in addition to the above, verify mode is disabled.
Encryption Array
64 bytes of encryption array are initially unprogrammed (all 1s).
Next
80C51/87C51/80C31
COMMENT
User ROM Data
ROM Encryption Key
ROM Security Bit 1
ROM Security Bit 2
Product specification