AN2136SC Cypress Semiconductor Corp, AN2136SC Datasheet - Page 276

• Manufacturer Part Number: AN2136SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2136SC

• Applications: USB Microcontroller
• Core Processor: 8051
• Program Memory Type: ROMless
• Controller Series: AN213x
• Ram Size: 8K x 8
• Interface: I²C, USB
• Number Of I /o: 8
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1309

A.3
The 8051 core has been designed to offer increased performance by executing instructions in a
4-clock bus cycle, as opposed to the 12-clock bus cycle in the standard 8051 (see Figure A-1.).
The shortened bus timing improves the instruction execution rate for most instructions by a
factor of three over the standard 8051 architectures.
Some instructions require a different number of instruction cycles on the 8051 core than they
do on the standard 8051. In the standard 8051, all instructions except for MUL and DIV take
one or two instruction cycles to complete. In the 8051 core, instructions can take between one
and five instruction cycles to complete. The average speed improvement for the entire
instruction set is approximately 2.5X, calculated as follows:
A - 2
Performance Overview
Note: Comparison is for 8051 and standard 8051
running at the same clock frequency.
Number of Opcodes
Total: 255
Appendix A: 8051 Introduction
150
51
43
2
Speed Improvement
Average: 2.5X
3.0X
1.5X
2.0X
2.4X
EZ-USB TRM v1.9