DS89C450-QNG+ Maxim Integrated Products, DS89C450-QNG+ Datasheet - Page 28

• Manufacturer Part Number: DS89C450-QNG+
• Description: IC MCU FLASH 64KB 25MHZ 44-PLCC
• Manufacturer: Maxim Integrated Products
• Series: 89Cr

Specifications of DS89C450-QNG+

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SIO, UART/USART
• Peripherals: Power-Fail Reset, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• 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: 44-LCC, 44-PLCC
• Processor Series: DS89C450
• 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: 4
• 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
• Development Tools By Supplier: DS89C450-KIT#
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Figure 8. Nonpage Mode, External Data Memory Access (Stretch = 0, CD1:CD2 = 10)
Figure 9. Nonpage Mode, External Data Memory Access (Stretch = 1, CD1:CD2 = 10)
XTAL1
RD/WR
XTAL1
RD/WR
Port 0
Port 2
Port 0
Port 2
ALE
PSEN
PSEN
ALE
MOVX
Instruction
Fetch
MOVX
Instruction
Fetch
A
A
A
A
MOVX
MOVX
1st Machine Cycle
1st Machine Cycle
A
A
MOVX Instruction
INST
INST
MOVX Instruction
2nd Machine Cycle
2nd Machine Cycle
DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
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Memory
Access
Stretch = 0
A
A
A
A
Memory Access
Stretch = 1
DATA
DATA
3rd Machine Cycle