HCS08 datasheet(315/374 Pages) NXP

315 / 374 page

Universal Serial Bus Device Controller (S08USBV1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

315

When the USB module receives a USB token on an enabled endpoint, it interrogates the BDT. The USB

module reads the corresponding endpoint BD entry and determines if it owns the BD and corresponding

data buffer.

17.4.2.3

Buffer Descriptor Formats

The buffer descriptors (BDs) are groups of registers that provide endpoint buffer control information for

the USB module and the MCU. The BDs have different meanings based on who is reading the BD in

memory.

The USB module uses the data stored in the BDs to determine:

•

Who owns the buffer in system memory

•

Data0 or Data1 PID

•

Release Own upon packet completion

•

Data toggle synchronization enable

•

How much data to be transmitted or received

•

Where the buffer resides in the buffer RAM.

The microcontroller uses the data stored in the BDs to determine:

•

Who owns the buffer in system memory

•

Data0 or Data1 PID

•

The received TOKEN PID

Table 17-21. USB RAM Organization

USB RAM

Offset

USB RAM Description of Contents

0x00

BDT

Endpoint 0 IN

Endpoint 0, OUT

Endpoint 1

Endpoint 2

Endpoint 3

Endpoint 4

Endpoint 5, Buffer EVEN

Endpoint 5, Buffer ODD

Endpoint 6, Buffer EVEN

0x1D

Endpoint 6, Buffer ODD

0x1E

RESERVED

0x1F

RESERVED

0x20

0xFF

USB RAM available for endpoint buffers

HCS08 bảng dữ liệu(PDF) 315 Page - NXP Semiconductors

HCS08 bảng dữ liệu(HTML) 315 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL