MPC235

Low-Speed USB Micro-Controller

This document contains information on a new product under development by Megawin. Megawin reserves the right to change or

discontinue this product without notice.

© Megawin Technology Co., Ltd. 2008 All rights reserved.

2008/12 version A4

MEGAWIN

General Description........................................................................................................................................ 3

Features .......................................................................................................................................................... 4

Pin Description ............................................................................................................................................... 5

Block Diagram ............................................................................................................................................... 6

Packages ......................................................................................................................................................... 7

Function Description ...................................................................................................................................... 8

Memory Map.................................................................................................................................................. 9

Special Function Register (SFR) .................................................................................................................. 10

Interrupt Vectors ............................................................................................................................................11

Interrupt Registers ................................................................................................................................ 12

IRQ enable flag............................................................................................................................. 12

IRQ status flag .............................................................................................................................. 12

IRQ clear flag ............................................................................................................................... 12

Watchdog Timer (WDT)............................................................................................................................... 13

System Control Registers ............................................................................................................................. 14

Power saving control ............................................................................................................................ 14

Release halt mode enable flag .............................................................................................................. 14

FCPU selector............................................................................................................................................... 15

Timer ............................................................................................................................................................ 16

Timer 0 ................................................................................................................................................. 16

USB .............................................................................................................................................................. 17

USB Block Diagram............................................................................................................................. 17

USB register access control .................................................................................................................. 17

USB SFR Category - Descriptions Summary....................................................................................... 18

USB SFR Description........................................................................................................................... 19

DCON: Device Control Register .................................................................................................. 19

FADDR: USB Function Address Register.................................................................................... 19

FPCON: Function Power Control Register .................................................................................. 20

FIE: Function Interrupt Enable Register....................................................................................... 20

FIFLG: Function Interrupt Flag Register...................................................................................... 21

IEN1: USB Interrupt Enable Register .......................................................................................... 21

EPINDEX: Endpoint Index Register ............................................................................................ 22

EPCON: Endpoint Control Register (Endpoint-Indexed)............................................................. 22

RXCNT: Receive FIFO Byte-Count Register (Endpoint-Indexed) .............................................. 23

RXCON: Receive FIFO Control Register (Endpoint-Indexed) .................................................... 23

RXDAT: Receive FIFO Data Register (Endpoint-Indexed) ......................................................... 24

RXSTAT: Endpoint Receive Status Register (Endpoint-Indexed) ................................................ 24

TXCNT: Transmit FIFO Byte-Count Register (Endpoint-Indexed) ............................................. 25

TXCON: Transmit FIFO Control Register (Endpoint-Indexed)................................................... 25

TXDAT: Transmit FIFO Data Register (Endpoint-Indexed) ........................................................ 26

TXSTAT: Endpoint Transmit Status Register (Endpoint-Indexed)............................................... 26

I/O Ports ....................................................................................................................................................... 27

Port 0 .................................................................................................................................................... 27

Port 1 .................................................................................................................................................... 27

Port 2 .................................................................................................................................................... 28

Port 3 .................................................................................................................................................... 28

Port 4 .................................................................................................................................................... 28

DPM control ......................................................................................................................................... 29

Programming Notice .................................................................................................................................... 30

Application Circuit ....................................................................................................................................... 31

Normal:................................................................................................................................................. 31