Fujitsu F2MC-16LX Hardware Manual page 288

16-bit microcontroller mb90330 series

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Table of Contents

CHAPTER 13 USB FUNCTION

[bit 6] RESUM: Resume setting bit

When it is in remote Wake-up enabled status (or DEVICE_REMOTE_WAKEUP bit is set with the

SET_FEATURE command by the host) and in suspend status, the resume operation is started by writing

1 to the RESUM bit. Clear the resume direction by writing "0" to the RESUM bit that was set to "1".

[bit 5] HCON: Host connection bit

Control a switch between an external pull-up resistor and the USB data line and allows the USB

Function to recognize connections to HOST PC or HUB.

Even if the external pull-up resistor is HOST at the state of ON or the connection is recognized from

the HUB, the bus reset and the command of the USB bus ignores when the HCON bit is set to "1".

Please clear the HCON bit before releasing reset of RST.

[bit 4] USTP:USB operation clock stop bit

Stop the clock of the USB operation part by setting the USTP bit. Setting the USTP bit can reduce

power consumption when keeping the USB out of service.

If the USTP bit is not used in the stop mode, wait for 3 cycles or 43 cycles to elapse in FULL speed

or in LOW speed (that is supported only in Mini-HOST mode) so that you can ensure that the reset

operation will function when you have set RST=1. You may clear the USTP bit and the RST bit at

USB resume start dictating bit release

USB resume start dictate

HOST PC or HUB and connection

HOST PC or HUB and state of cutting

Clock stop of USB operation part

Operating mode