C541U_99 Datasheet, PDF (120/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER

On-Chip Peripheral Components
C541U
6.4.8 Low Speed Mode
The features of this mode are listed below :
• Data rate of 1.5 Mbit/s
• Three endpoints : one bidirectional control endpoint, EP0
two interrupt endpoints, EP1 and EP2
• Maximum data packet length of 8 bytes, fully direct accesible data packet
• Two supported transfer modes : control transfer, through EP0
interrupt transfer, interval from 10 ms to 255 ms
The low speed operation require a different set of registers than the full speed operation. These
registers are described in section 6.4.8.5.
6.4.8.1 Initialization
After a successful hardware reset, the device is by default in USB low speed mode. The initialization
phase described in section 6.4.5 is required only for full speed mode.
Semiconductor Group
6-75
1999-04-01