MPC8280 datasheet(833/1386 Pages) FREESCALE

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Universal Serial Bus Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

27-17

27.5.7

USB Function Programming Model

The following sections describe USB controller registers.

27.5.7.1

USB Mode Register (USMOD)

USMOD, shown in Figure 27-10, controls the USB controller operation mode.

Table 27-9 describes USMOD fields.

Field

LSS

RESUME

—

SFTE

TEST

HOST

Reset

0000_0000

R/W

Addr

0x11B60

Figure 27-10. USB Mode Register (USMOD)

Table 27-9. USMOD Fields

Bits

Name

Description

LSS

Low-speed signaling. Selects the signaling speed. The actual bit rate depends on the USB

clock source.

0 Full-speed (12-Mbps) signaling. Normal operation.

1 Low-speed (1.5-Mbps) signaling. For a point-to-point connection with a low-speed device or

for local loopback testing.

RESUME

Generate resume condition. When set, this bit generates a resume condition on the USB.

This bit should be used if the function wants to exit the suspend state.

2–3

—

Reserved, should be cleared.

SFTE

Start-of-Frame Timer Enable. Setting this bit enables the Start-of-Frame timer and automatic

SOF transmission. See Section 27.5.7.8, “USB Start of Frame Timer (USSFT)" and

Section 27.5.2, “SOF Transmission for USB Host Controller" for more information.

0 SOF timer is disabled

1 SOF timer is enabled

Note: When SFTE is 1, the PC21 pin cannot be used as CP_INT since the CP interrupt is used

internally for generating the SOF packet.

TEST

USB controller test (loopback) mode

0 Test mode is disabled

1 Test mode is enabled

Note: This bit may be set only when HOST is set (USB host mode)

HOST

USB host mode

0 USB host is disabled

1 USB host is enabled

Enable USB. When the EN bit is cleared, the USB is in a reset state

0 USB is disabled

1 USB is enabled

Note: Setting this bit automatically disables SCC4.

Note: Other bits of the USMOD should not be modified by the user while EN is set.

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