AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 61

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• 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: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

The EZ-USB 32-KB ROM version contains program memory from 0x0000 through
0x7FFF, and data memory from 0x0000 through 0x0FFF.
Code for this ROM version can be developed and tested using the AN2131Q with an
external code memory (EA=1, Figure 3-5). As long as the 8051 limits internal RAM
access to 0x0000-0x0FFF and accesses the EZ-USB registers and bulk data at 0x7B40-
0x7FFF, the code in the external memory will be the identical image of the code that will
ultimately be internal at 0x0000-0x7FFF in the ROM version.
Page 3-8
FFFF
7FFF
7B40
8000
1000
0FFF
0000
Inside EZ-USB
Registers(RD,WR)
Data (RD,WR)
Note 1: OK to populate data memory here, but no RD# or WR# strobes are generated.
Note 2: OK to populate code memory here, but no PSEN# strobe is generated.
Figure 3-7. 32-KB ROM, 4-KB RAM Version
Memory(PSEN)
Chapter 3. EZ-USB Memory
Internal Code
(RD, WR)
(RD,WR)
External
External
Memory
(Note 1)
Memory
(Note 1)
Data
Data
Outside EZ-USB
External
Memory
(Note 2)
EZ-USB TRM v1.9
(PSEN)
Code