C8051F38C-GMR View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F38C-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

USB Register Definition 21.8. POWER: USB0 Power

Bit

7

6

5

4

3

2

1

0

Name ISOUD

USBINH USBRST RESUME SUSMD SUSEN

Type R/W

R/W

R/W

R/W

R/W

R/W

R

R/W

Reset

0

0

0

0

0

0

0

0

USB Register Address = 0x01

Bit Name

Function

7 ISOUD ISO Update Bit.

This bit affects all IN Isochronous endpoints.

0: When software writes INPRDY = 1, USB0 will send the packet when the next IN token

is received.

1: When software writes INPRDY = 1, USB0 will wait for a SOF token before sending the

packet. If an IN token is received before a SOF token, USB0 will send a zero-length data

packet.

6:5 Unused Read = 00b. Write = don’t care.

4 USBINH USB0 Inhibit Bit.

This bit is set to 1 following a power-on reset (POR) or an asynchronous USB0 reset.

Software should clear this bit after all USB0 transceiver initialization is complete. Soft-

ware cannot set this bit to 1.

0: USB0 enabled.

1: USB0 inhibited. All USB traffic is ignored.

3 USBRST Reset Detect.

Read:

Write:

0: Reset signaling is not present. Writing 1 to this bit forces an

1: Reset signaling detected on asynchronous USB0 reset.

the bus.

2 RESUME Force Resume.

Writing a 1 to this bit while in Suspend mode (SUSMD = 1) forces USB0 to generate

Resume signaling on the bus (a remote wakeup event). Software should write RESUME

= 0 after 10 to 15 ms to end the Resume signaling. An interrupt is generated, and hard-

ware clears SUSMD, when software writes RESUME = 0.

1 SUSMD Suspend Mode.

Set to 1 by hardware when USB0 enters suspend mode. Cleared by hardware when soft-

ware writes RESUME = 0 (following a remote wakeup) or reads the CMINT register after

detection of Resume signaling on the bus.

0: USB0 not in suspend mode.

1: USB0 in suspend mode.

0 SUSEN Suspend Detection Enable.

0: Suspend detection disabled. USB0 will ignore suspend signaling on the bus.

1: Suspend detection enabled. USB0 will enter suspend mode if it detects suspend sig-

naling on the bus.

Rev. 1.4

185

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