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ST2608B Datenblatt(PDF) 2 Page - Sitronix Technology Co., Ltd. |
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ST2608B Datenblatt(HTML) 2 Page - Sitronix Technology Co., Ltd. |
2 / 34 page ST2608B 2/34 1 GENERAL DESCRIPTION The ST2608B 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 ST2608B suitable for power saving and long battery life designs. The ST2608B integrates various logic to support functions on-chip which are needed by system designers. The ST2608B features the capacity of memory access of maximum 44M bytes and DMA function for fast memory transfer. Six chip-select pins are equipped for direct connection to external ROM, SRAM, Flash memory or other devices. The maximum size for a single external memory device can be 16M bytes. The ST2608B has 56 I/Os grouped into 6 ports. They are Port-A ~ Port-F and Port-L, where the Port-F is 8 open drain output pins shared with LCD COMs. Each I/O pins can be programmed to input or output individually. Port-C inputs have both pull-up and pull-down options. The other input pins have only pull-up options. In the case of output mode, Port-C outputs have open-drain type and CMOS type options; while the other ports are fixed at CMOS type. The Port-A and Port-B are designed for keyboard scan function. The Port-A inputs are further equipped with de-bounce and transition triggered interrupt function. The Port-C/D/E/L are shared with other system functions. All the properties of I/O pins are still programmable when they are configured to be other special functional signals. This enlarges the flexibility of the usage of the functional signals. The ability of driving large LCD panels, up to 240x160, and hardware gray-level support rich the display information and the diversity of contents as well. By the patented sharing mechanism design of internal memory, the LCD display function can be done without the need of external display RAM. The variable LCD buffer design also makes it feasible to use small internal display RAM as the buffer of large-sized display. User may free major internal RAM for computing or temporary access while keeping the display content. The clock of LCD (LCDCK) is not only sourced from main-frequency (OSC), it can also be sourced by OSCX (32KHz crystal) to make current consumption to be minimum. The ST2608B equips serial communication ports, 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. Three 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. The built-in four-channel PSG are designed to generate key tone, melody, voice, and speech. Two dedicated pins with large driving capacity can drive a buzzer/speaker directly. The ST2608B has a Low Voltage Detector (LVD) for power management usage. 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 ST2608B equips a Low Voltage Reset function to keep the whole system in reset status when power is low. After the power returns to normal level, the system may recover its original states and keeps working correctly. With these integrated functions inside, the ST2608B single chip microcontroller is a right solution for PDA, translator, databank and other consumer products. The block diagram of ST2608B is shown in the following figure. |
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