HCS08 datasheet(297/374 Pages) NXP

297 / 374 page

Universal Serial Bus Device Controller (S08USBV1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

297

17.1.6

Block Diagram

Figure 17-2 is a block diagram of the USB module.

Figure 17-2. USB Module Block Diagram

Stop3

The USB module is optionally available in stop3.

A reduced current consumption mode may be required for USB suspend mode per USB Specification Rev. 2.0,

and stop3 mode is useful for achieving lower current consumption for the MCU and hence the overall USB

device. Before entering stop3 via firmware, the user must ensure that the device settings are configured for

stop3 to achieve USB suspend current consumption targets.

The USB module is notified about entering suspend mode when the SLEEPF flag is set; this occurs after the

USB bus is idle for 3 ms. The device USB suspend mode current consumption level requirements are defined

by the USB Specification Rev. 2.0 (500

μA for low-power and 2.5 mA for high-power with remote-wakeup

enabled).

If USBRESMEN in USBCTL0 is set, and a K-state (resume signaling) is detected on the USB bus, the LPRESF

bit in USBCTL0 will be set. This triggers an asynchronous interrupt that will wakeup the MCU from stop3 mode

and enable clocks to the USB module. The USBRESMEN bit must then be cleared immediately after stop3

recovery to clear the LPRESF flag bit.

Wait

USB module is operational.

Table 17-2. Operating Modes (continued)

Mode

Description

USB RAM

256 bytes

IRQ

USBDP

USBDN

Serial Interface Engine

USB CONTROLLER

XCVR

VREG

Protocol and Rate

Match

VUSB33

BVCI

Target

Logic

BVCI

Initiator

Logic

48-MHz Reference Clock

24-MHz Clock (bus clk)

Enable

(SIE)

USBDP Pullup

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