DS87C550-QCL+ Maxim Integrated Products, DS87C550-QCL+ Datasheet - Page 33

• Manufacturer Part Number: DS87C550-QCL+
• Description: IC MCU EPROM ADC/PWM HS 68-PLCC
• Manufacturer: Maxim Integrated Products
• Series: 87Cr

Specifications of DS87C550-QCL+

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, SIO, UART/USART
• Peripherals: Power-Fail Reset, PWM, WDT
• Number Of I /o: 55
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-LCC, 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

OTHER EPROM OPTIONS
The DS87C550 has user-selectable options that must be set before beginning software execution. These
options use EPROM bits rather than SFRs.
The EPROM selectable options may be programmed as shown in Table 10. The Option Register sets or
reads these selections. The bits in the Option Register have the following function:
Bit 7 -4
Bit 3
Bit 2-0
SIGNATURE
The Signature bytes identify the product and programming revision to EPROM programmers. This
information is located at programming addresses 30h, 31h, and 60h. This information is as follows:
Address
30h
31h
60h
EPROM PROGRAMMING CONFIGURATION Figure 5
Reserved. Program to a 1.
Watchdog POR default.
Set to 1: Watchdog reset function is disabled on power-up.
Set to 0: Watchdog reset function is enabled automatically on power up.
Reserved. Program to a 1.
Value
DAh
55
00
Meaning
Manufacturer
Model
Extension
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