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參數(shù)資料
| 型號： | 7643 |
| 英文描述： | IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE |
| 中文描述： | 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03 |
| 文件頁數(shù)： | 53/120頁 |
| 文件大?。?/td> | 1369K |
| 代理商： | 7643 |
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Rev.1.00 Jul 30, 2003 page 53 of 119
7643 Group
[USB Endpoint x (x = 0 to 2) IN Max. Packet Size Register]
IN_MAXP
This register specifies the maximum packet size (MAXP) of an
endpoint x IN packet. The value set for endpoint 1 is the number
of transmitted bytes divided by 8, and the value set for endpoints
0 and 2 is the actual number of transmitted bytes. The CPU can
change these values using the SET_DESCRIPTOR command.
The initial value for endpoints 0 and 2 is 8, and the initial value for
endpoint 1 is 1.
[USB Endpoint x (x = 0 to 2) OUT Max. Packet Size Register]
OUT_MAXP
This register specifies the maximum packet size (MAXP) of an
Endpoint x OUT packet. The value set for endpoint 1 is the num-
ber of received bytes divided by 8, and the value set for endpoints
0 and 2 is the actual number of received bytes. The CPU can
change these values using the SET_DESCRIPTOR command.
The initial value for endpoints 0 and 2 is 8, and the initial value for
endpoint 1 is 1. When using the endpoint 0, both USB endpoint x
IN max. packet size register (IN _MAXP) and USB endpoint x
OUT max. packet size register (OUT_MAXP) are set to the same
value. Changing one register’s value effectively changes the value
of the other register as well.
■
Notes
Only flash memory version acknowledges IN/OUT token input to
the endpoints 3 and 4. For its countermeasure program the follow-
ing in the initial settings or other routines.
[USBINDEX] = 03h
; USBINDEX=58H
[IN_MAXP]=00h
; IN_MAXP=5BH
[OUT_MAXP]=00h
; OUT_MAXP=5CH
[USBINDEX]=04h
; USBINDEX=58H
[IN_MAXP]=00h
; IN_MAXP=5BH
[OUT_MAXP]=00h
; OUT_MAXP=5CH
(This program does not affect the operation of mask ROM ver-
sion.)
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Fig. 46 Structure of USB endpoint x IN max. packet size register
Fig. 47 Structure of USB endpoint x OUT max. packet size register
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