DS89C420-QCL Maxim Integrated Products, DS89C420-QCL Datasheet - Page 27

• Manufacturer Part Number: DS89C420-QCL
• Description: IC MCU ULTRA 33MHZ HP 44-PLCC
• Manufacturer: Maxim Integrated Products
• Series: 89Cr

Specifications of DS89C420-QCL

• 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: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-LCC, 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Figure 9. Non-Page Mode, External Data-Memory Access (Stretch = 0, CD1:CD2 = 10)
Figure 10. Non-Page Mode, External Data-Memory Access (Stretch = 1, CD1:CD2 = 10)
RD WR
RD WR
XTAL1
XTAL1
Port 0
Port 2
Port 0
Port 2
PSEN
PSEN
ALE
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
27 of 47
Memory
Access
Stretch = 0
A
A
A
A
Memory Access
Stretch = 1
DATA
DATA
3rd Machine Cycle