H8SSLASH2218 datasheet(545/750 Pages) RENESAS

Il numero della parte	H8S/2218

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

Logo

545 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 497 of 698

REJ09B0074-0600

14.5

Communication Operation

14.5.1

Initialization

The USB must be initialized as described in the flowchart in figure 14.2.

Cancel power-on reset

USB function

Firmware

Yes

Set each interrupt

Start USB operationg clock

oscillation.

USB

operating clock

stabilization time has

passed?

Cancel USB module stop 2

(Clear MSTPB0 in

MSTPCRB to 0)

Clear CK48READY in UIFR3 to 0

USB module stop 2

(Write to 1 MSTPB0 in MSTPCRB)

Wait for USB cable

connection

Yes

(Bus powered)

(Self powered)

To USB cable

connecting procedure

Enter power-down mode

(If necessary)

Set each interrupt

Wait for USB operating

clock stabilization

USB interface operation OK

USB operating clock stabilization

detection interrupt occurs.

Cancel USB interface reset

(Clear UIFRST in UCTLR to 0)

Self powered?

System needs to

enter power-down

mode?

Cancel USB module stop 1

(Clear USBSTP1 in

EXMDLSTP to 0)

Select USB operating clock

(Write 1 to UCKS3 to UCKS0

in UCTLR)

To 14.5.2 (1)

EXIRQ0

Note:

Before entering power-down mode, set USB module stop 2 by setting the MSTPB0 bit in MSTPCRB to 1.

Figure 14.2 USB Initialization

H8S/2218 Scheda tecnica(PDF) 545 Page - Renesas Technology Corp

H8S/2218 Scheda tecnica(HTML) 545 Page - Renesas Technology Corp

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

Scheda tecnica Scarica

Link URL