ST2604B datasheet(2/33 Pages) SITRONIX

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ST2604B

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GENERAL DESCRIPTION

The ST2604B 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

ST2604B suitable for power saving and long battery life

designs. The ST2604B integrates various logic to support

functions on-chip which are needed by system designers.

The ST2604B 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 ST2604B has 55 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-B/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 160x160, 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 ST2604B 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 ST2604B 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 ST2604B 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 ST2604B single chip

microcontroller is a right solution for PDA, translator, databank

and other consumer products.

The block diagram of ST2604B is shown in the following figure.

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