AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 241

• 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

These registers implement the EZ-USB Autopointer.
AUTOPTRH/L
The 8051 loads a 16-bit address into the AUTOPTRH/L registers. Subsequent reads or
writes to the AUTODATA register increment the 16-bit value in these registers. The
loaded address must be in internal EZ-USB RAM. The 8051 can read these registers to
determine the address must be in internal EZ-USB RAM. The 8051 can read these regis-
ters to determine the address of the next byte to be accessed via the AUTODATA register.
AUTODATA
8051 data read or written to the AUTODATA register accesses the memory addressed by
the AUTOPTRH/L registers, and increments the address after the read or write.
These registers allow FIFO access to the bulk endpoint buffers, as well as being useful for
internal data movement. Chapter 6, "EZ-USB Bulk Transfers" and Chapter 8, "EZ-USB
Isochronous Transfers" explain how to use the Autopointer for fast transfers to and from
the EZ-USB endpoint buffers.
Page 12-48
AUTOPTRH
AUTOPTRL
AUTODATA
A15
R/W
R/W
R/W
A7
D7
b7
b7
b7
x
x
x
A14
R/W
R/W
R/W
A6
D6
b6
b6
b6
x
x
x
A13
R/W
R/W
R/W
A5
D5
b5
b5
b5
x
x
x
Figure 12-39. Auto Pointer Registers
Auto Pointer Address High
Auto Pointer Address Low
Chapter 12. EZ-USB Registers
Auto Pointer Data
A12
R/W
R/W
R/W
A4
D4
b4
b4
b4
x
x
x
A11
R/W
R/W
R/W
A3
D3
b3
b3
b3
x
x
x
A10
R/W
R/W
R/W
A2
D2
b2
b2
b2
x
x
x
R/W
R/W
R/W
A9
A1
D1
b1
b1
b1
x
x
x
EZ-USB TRM v1.9
R/W
R/W
R/W
A8
A0
D0
b0
b0
b0
x
x
x
7FE3
7FE4
7FE5