MPC2F35L datasheet(16/46 Pages) MEGAWIN

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MPC2F35_USB Data Sheet

MEGAWIN

Write 0 into the URD bit

Whenever USB engine finished a transaction, it will generate an interrupt to acknowledge MPC2F35.

The user can get information about the transaction through the above sequence. When USB engine

received a reset instruction from the host, it will reset by itself and generate an interrupt. When USB

engine received a wake-up instruction from the host while the device is being in the stop mode, it will

generate a signal to enable the oscillator. If the host and the device are both in the stop mode, a falling

edge on Port 3 can wake-up the device, and then remote wake up the host through USB engine.

DPM control

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00E8H

DPM_CTL

√

00E9H

DPMO

DPO

DMO

√

00EAH

DPMI

DPI

DMI

√

C1, C0: USB bus (D+ and D-) mode control selector.

0x: USB bus is at the USB operation (Default)

10: USB bus is at the PS/2 interface operation

DPMO: PS/2 data output on USB data bus line (D+/D-), 0: output low, 1: pull-high

DPMI: Value on the USB data bus line (Read only) while working at the PS/2 operation

MPC2F35’s USB bus lines (D+ and D -) have two operating modes: USB low speed and PS/2 interface

mode. User can program the C0 and C1 bit in the CDPM_CTL SFR to determine the operating mode of

USB bus. The DPI and DMI bit in the DPMI SFR will record the content on the D+ and D- pin

respectively.

The firmware can judge the USB bus line (D+ and D-) connection will be USB or PS/2 protocol by

reading the value of the DPI and DMI bit in the DPMI SFR. For PS/2 interface application, the C1 and

C0 in the DPM_CTL SFR have to set “10” first, thus the USB function will be unavailable. The user

programs the value of USB bus (D+/D-) into the DPO and DMO bit in the DPMO SFR when MPC2F35

controls the D+/D- pin for the PS/2 operation. When DPO/DMO is programming as writing 0, it will make

the D+/D- pin to output low. On the other hand, writing 1 will cause these pins to be pulled high. This I/O

control operation would be easy to perform the PS/2 interface.

MPC2F35L Datasheet(PDF) 16 Page - Megawin Technology Co., Ltd

MPC2F35L Datasheet(HTML) 16 Page - Megawin Technology Co., Ltd

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