DS87C530-QNL Maxim Integrated Products, DS87C530-QNL Datasheet - Page 29

• Manufacturer Part Number: DS87C530-QNL
• Description: IC MCU EPR/ROM W/RTC 33MZ 52PLCC
• Manufacturer: Maxim Integrated Products
• Series: 87Cr

Specifications of DS87C530-QNL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, SIO, UART/USART
• Peripherals: Power-Fail Reset, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-LCC, 52-PLCC
• Processor Series: DS87C530
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: UART
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Other names: DS87C530QNL

DS87C530 SECURITY OPTIONS
The DS87C530 employs a standard three-level lock that restricts viewing of the EPROM contents. A 64-
byte Encryption Array allows the authorized user to verify memory by presenting the data in encrypted
form.
Lock Bits
The security lock consists of 3 lock bits. These bits select a total of 4 levels of security. Higher levels
provide increasing security but also limit application flexibility. Table 10 shows the security settings.
Note that the programmer cannot directly read the state of the security lock. User software has access to
this information as described in the Memory section.
Encryption Array
The Encryption Array allows an authorized user to verify EPROM without allowing the true memory to
be dumped. During a verify, each byte is Exclusive NORed (XNOR) with a byte in the Encryption Array.
This results in a true representation of the EPROM while the Encryption is unprogrammed (FFh). Once
the Encryption Array is programmed in a non-FFh state, the verify value will be encrypted.
For encryption to be effective, the Encryption Array must be unknown to the party that is trying to verify
memory. The entire EPROM also should be a non-FFh state or the Encryption Array can be discovered.
The Encryption Array is programmed as shown in Table 9. Note that the programmer cannot read the
array. Also note that the verify operation always uses the Encryption Array. The array has no impact
while FFh. Simply programming the array to a non-FFh state will cause the encryption to function.
Other EPROM Options
The DS87C530 has user-selectable options that must be set before beginning software execution. These
options use EPROM bits rather than SFRs.
Program the EPROM selectable options as shown in Table 9. The Option Register sets or reads these
selections. The bits in the Option Control Register have the following function:
DS87C530 Signature
The Signature bytes identify the product and programming revision to EPROM programmers. This
information is at programming addresses 30h, 31h, and 60h. This information is as follows:
Bits 7 to 4
Bit 3
Bits 2 to 0
Reserved, program to 1.
Watchdog POR default. Set = 1; Watchdog reset function is disabled on power-up.
Set = 0; Watchdog reset function is enabled automatically.
Reserved. Program to 1.
ADDRESS
30h
31h
60h
DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
VALUE
29 of 45
DAh
30h
01h
Manufacturer
MEANING
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