NEC switch User Manual
Page 121
CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
121
(9) Remote wake-up control register (REMWUP)
This register transmits the Resume signal to perform remote wakeup.
Remote wakeup must be performed after confirming that bus idle has continued longer than 5 ms.
REMWUP is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets REMWUP to 08H.
Figure 8-19. Format of Remote Wakeup Control Register
Symbol
6
7
5
4
<3>
<2>
<1>
<0>
0
0
0
0
PULLDM PULLDP PULLEN WAKEUP
PULLDM
D- lead low/high fixed output setting
0
1
FF6AH
Address
REMWUP
After reset
08H
R/W
R/W
D- (TXDM) is fixed to low output.
D- (TXDM) is fixed to high output.
PULLDP
D+ lead low/high fixed output setting
0
1
D+ (TXDP) is fixed to low output.
D+ (TXDP) is fixed to high output.
PULLEN
D+/D- lead fixed output enable
0
1
Output from transmit buffer is input to USB driver.
Level set to PULLDP or PULLDM is input to USB driver.
WAKEUP
Wakeup signal output
0
1
No data is sent.
Pin status set to PULLDP or PULLDM is output.