C541U_99 Datasheet, PDF (146/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER

Interrupt System
C541U
Special Function Register GEPIR (Address D6_H)
ResetValue : 00H
Bit No. MSB
7
6
D6H DRVI 0
rw
r
LSB
5
4
3
2
1
0
0 EPI4 EPI3 EPI2 EPI1 EPI0 GEPIR
r
r
r
r
r
r
Bit
DRVI
Function
Device request value interrupt
Bit DRVI is set each time the host sends device request that contains one
or more of the following :
- Configuration Value (through SET_CONFIGURATION device request)
- Alternate Setting (through SET_INTERFACE device request)
- Interface (through SET_INTERFACE device request).
This flag can only be cleared by writing ‘0’ to the bit. Writing ‘1’ to the bit will
be ignored.
Special Function Register USBPWD ( Address E6H )
Reset Value : 00H
Bit No. MSB
LSB
7
6
5
4
3
2
1
0
E6H
0
r
0 SUSPIE DADDIE SUSP DADD TPWD RPWD USBPWD
r
rw
rw
r
r
rw
rw
Bit
SUSP
DADD
Function
Suspend mode
This bit is set when the USB has been idle for more than 3 ms. It will remain set
until there is a non-idle state on the USB cable.
Device attached or detached
Bit DADD monitors the state of the associated I/O pin DADD (see also TYPE bit
field of USBDCR).
Semiconductor Group
7-13
1997-10-01