Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 21 USB FUNCTION CONTROLLER (USBF)
R01UH0042EJ0500 Rev.5.00 Page 1121 of 1513
Aug 12, 2011
(36) UF0 active alternative setting register (UF0AAS)
This register specifies a link between the Interface number and Alternative Setting.
This register can be read or written in 8-bit units.
USBF of the V850ES/JG3-H and V850ES/JH3-H can set a five-series Alternative Setting (Alternate Setting 0, 1, 2,
3, and 4 can be defined) and a two-series Alternative Setting (Alternative Setting 0 and 1 can be defined) for one
Interface.
ALT2UF0AAS IFAL21
5
IFAL20 ALT2EN
3
ALT5
2
IFAL51
1
IFAL50 ALT5EN
Address
00200082H
After reset
00H
0467
Bit position Bit name Function
7, 3 ALTn
These bits specify whether an n-series Alternative Setting is linked with Interface 0. When
these bits are set to 1, the setting of the IFALn1 and IFALn0 bits is invalid.
1: Link n-series Alternative Setting with Interface 0.
0: Do not link n-series Alternative Setting with Interface 0 (default value).
These bits specify the Interface number to be linked with the n-series Alternative Setting.
If the linked Interface number is outside the range specified by the UF0AIFN register, the
n-series Alternative Setting is invalid (ALTnEN bit = 0).
IFALn1 IFALn0 Interface number to be linked
1 1 Links Interface 4.
1 0 Links Interface 3.
0 1 Links Interface 2.
0 0 Links Interface 1.
6, 5,
2, 1
IFALn1, IFALn0
Do not link a five-series Alternative Setting and a two-series Alternative Setting with the
same Interface number.
4, 0 ALTnEN
These bits validate the n-series Alternative Setting. Unless these bits are set to 1, the
setting of the ALTn, IFALn1, and IFALn0 bits is invalid.
1: Validate the n-series Alternative Setting.
0: Do not validate the n-series Alternative Setting (default value).
Remark n = 2, 5
For example, when the UF0AIFN register is set to 82H and the UF0AAS register is set to 15H, Interfaces 0, 1, 2,
and 3 are valid. Interfaces 0 and 2 support only Alternative Setting 0. Interface 1 supports Alternative Setting 0
and 1, and Interface 3 supports Alternative Setting 0, 1, 2, 3, and 4. With this setting, requests GET_INTERFACE
wIndex = 0/1/2/3, SET_INTERFACE wValue = 0 & wIndex = 0/2, SET_INTERFACE wValue = 0/1 & wIndex = 1,
and SET_INTERFACE wValue = 0/1/2/3/4 & wIndex = 3 are automatically responded to, and a STALL response is
made to the other GET/SET_INTERFACE requests.