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ST2205U Datasheet(PDF) 2 Page - Sitronix Technology Co., Ltd. |
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ST2205U Datasheet(HTML) 2 Page - Sitronix Technology Co., Ltd. |
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2 / 32 page  ST2205U Version 1.0 2/32 6/13/2007 12-bit current DAC with two 4-word buffer Universal Asynchronous Receiver/Transmitter (UART) – Full-duplex operation – Baud rate generator with one digital PLL – Standard baud rates of 600 bps to 115.2 kbps – Both transmitter and receiver buffers supported – Direct glueless support of IrDA physical layer protocol – Two sets of I/Os (TX,RX) for two independent devices Serial Peripheral Interface (SPI) – Inter IC sound (IIS) supported – Master and slave modes – Five serial signals including enable and data-ready – Both transmitter and receiver buffers supported – Programmable data length from 7-bit to 16-bit Three power down modes – WAI0 mode – WAI1 mode – STP mode On-chip ICE debug interface 2 2.. G GE EN NE ER RA AL L D DE ES SC CR RIIP PT TIIO ON N The ST2205U is a 8-bit integrated microcontroller designed with CMOS silicon gate technology. The true static CPU core, power down modes and dual oscillators design makes the ST2205U suitable for power saving and long battery life designs. The ST2205U integrates various logic to support functions on-chip which are needed by system designers. This is also important for lower system complexity, small board size and, of course, shorter time to market and less cost. The ST2205U features the capacity of memory access of maximum 44M bytes which is needed by products with large data bases. Six chip selects are equipped for direct connection to external ROM, SRAM, Flash memory or other devices. Maximum one single device of 16M bytes is possible. Two DMA channels make fast data transfer possible and easy. Both source and destination pointers can refer to the whole memory space with 15-bit pointers and bank registers. Besides normal operation, two special modes are designed for double transfer speed of Nand Flash memory and also fast graphic operation between two display pictures. Nand Flash is a low cost mass data storage solution for newly design. The ST2205U equips a Nand flash interface to connect both Nand and And Flash memories. Both ECC generating and checking functions are supported. These are very important for Flash data management. The ST2205U has 56 I/Os grouped into 7 ports, Port-A ~ Port-F and Port-L. Each pin can be programmed to input or output. There are two options: pull-up/down for inputs of Port-C and only pull-up for inputs of the other ports. In case of output, there are open-drain/CMOS options for outputs of PortC and only CMOS for other ports. Port-A is designed for keyboard scan with de-bounce and transition triggered interrupt, while Port-C/D/E/F/L are shared with other system functions. All the properties of I/O pins are still programmable when they are assigned to another function. This enlarges the flexibility of the usage of function signals. The internal 32K bytes RAM helps to drive large LCD panels up to 160xRGBx120. Together with 16-graylevel support, the ST2205U can rich display information and the diversity of contents as well. This is done with no need of external display RAM because of the special internal memory sharing design. The variable display buffer technique also make large panel size with small internal RAM possible. User may free major internal RAM for temporary computing or access while keeping the display content correct. The ST2205U equips serial communication ports of one UART and one SPI to perform different communications, ex.: RS-232 and IrDA, with system components or other products such as PC, Notebook, and popular PDA. Two clocking outputs can produce synthesized PWM signals or high frequency carrier for IR remote control. This helps products become more useful in our daily life. Communication with PC via USB is becoming more and more popular. The ST2205U features one PLL, a 3.3V regulator, and a USB 2.0 Full speed device engine to satisfy the strong demand of fast data transfer from market. Both HID and Mass storage classes are supported as well as the firmware libraries and the Windows drivers. The built-in four channels PSG and a 12-bit current DAC provide a nice quality voice together with a 4-channel wavetable melody in the background. Both voice and melody functions have buffers to make program easier and well structured, and also a 16x8 multiplier is to control the volumn of each channel. Besides hardware, ADPCM algorithm and a MIDI converter Windows software are also provided to speed up the development. In addition to current DAC, two dedicated pins with large driving capacity can drive a buzzer/speaker directly for minimum cost. The ST2205 has one Low Voltage Detector (LVD) for power management. The status of internal or external power can be detected and reported to the management software. Power bouncing during power on is a major problem when designing a reliable system. The ST2205U equips Low Voltage Reset (LVR) function to keep whole system in reset status when power is low. After the power backs to normal, the system may recover its original states and keeps working correctly. Besides LVR, Watch Dog Timer (WDT) is also built-in and is an essential function for a good design. Power consumption is another big issue for a battery-powered device. The ST2205U has different power down modes and clock switch scheme to make the consuming power as low as possible. The built-in Real Time Clock (RTC) is not only for keeping time correctly but also an alternative of software timer with much lower working power. The ST2205U equips an ICE debug interface for efficient development flow. Besides hardware emulator, a software simulator is also supported to save programmers setting up the system and makes programming be at anywhere. |
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