Cypress AN2131QC 제품 설명서 - 페이지 9

{카테고리_이름} Cypress AN2131QC에 대한 제품 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Cypress AN2131QC 16 페이지. Ez-usb series 2100 usb controller

페이지 인쇄

To write data to outside logic, the 8051 loads a data pointer with a USB FIFO register address, and then executes a "movx

a,@dptr" instruction to move a byte from the FIFO to the 8051 accumulator. The EZ-USB core simultaneously broadcasts the FIFO

data on the external data bus pins and generates the external write signal FWR# (Fast Write). A 24 MHz clock is provided for use

as an external FIFO clock, if required. EZ-USB control bits allow the timing and polarity of the FWR# signal to be tailored for

different external interface requirements.

To read data from outside logic, the 8051 loads a data pointer with a USB FIFO register address, and then executes a "movx

@dptr,a" instruction to move a byte from the accumulator to the FIFO. The EZ-USB core discards the accumulator data and instead

writes a byte from the external data bus pins to the FIFO. The EZ-USB core provides the external read signal FRD# (Fast Read) to

strobe the data, and a 24 MHz clock. Like the FRW# signal, the FRD# signal may be tailored for different interface requirements.

A Leap in Performance with 8051 Compatibility

The enhanced 8051 processor

increases performance by

executing most instructions in

four clock cycles instead of

twelve, as in the standard 8051.

The enhanced 8051 core also

runs at 24 MHz; that's twice as

fast as the standard part. These

factors improve the execution

rate for most instructions by a

factor of five. The enhanced

8051 core contained in the

EZ-USB family is binary-code

compatible and performs the

same functions as the industry-

standard 8051. The effects of

instructions on bits, flags, and

other status functions are identi-

cal to the standard 8051. The

enhanced 8051 core also provides

special function registers that

Feature

Clocks per instruction cycle

Data pointers

Serial ports (UARTs)

16-bit timers

Interrupt sources (int and ext)

Stretch memory cycles

Nominal operating frequency 12 MHz

Nominal operating voltage

EZ-USB Series 2100

support extra features such as a

second data pointer, a second

UART, cycle-stretched timing, an

expanded interrupt system, and

enhanced timers.

Standard

Anchor

24 MHz

5 V

3.3 V

Yes