AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 59

• 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

When EA=1 (Figure 3-5), all code (PSEN) memory is external. All internal EZ-USB
RAM is data memory. This gives the user over 6-KB of general-purpose RAM, accessible
by the MOVX instruction.
Page 3-6
Note
Figures 3-4 and 3-5 assume that the EZ-USB chip uses isochronous endpoints, and there-
fore that the ISODISAB bit (ISOCTL.0) is LO. If ISODISAB=1, additional data RAM
appears internally at 0x2000-0x27FF, and the RD#, WR#, CS#, and OE# signals are
modified to exclude this memory space from external data memory.
1FFF
FFFF
1F3F
1B40
8000
7B40
2000
0000
Note 1: OK to populate data memory here--RD#, WR#, CS# and OE# are inactive.
Unused Bulk Buffers
Inside EZ-USB
Registers(RD,WR)
Data (RD,WR)
(RD,WR)
Figure 3-5. EZ-USB Memory Map with EA=1
Chapter 3. EZ-USB Memory
(RD, WR)
(RD,WR)
External
Memory
(Note 1)
External
Memory
(Note 1)
Data
Data
Outside EZ-USB
External
Memory
(PSEN)
Code
EZ-USB TRM v1.9