ST2204 datasheet(2/24 Pages) SITRONIX

2 / 24 page

ST2204

Ver 0.6

2/24

2008/11/10

2.. G

L D

RIIP

TIIO

The ST2204 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 ST2204

suitable for power saving and long battery life designs. The

ST2204 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 ST2204 features the capacity of memory access of

maximum 44M bytes which is needed by products with large

data bases, and also DMA function for fast memory transfer.

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.

The ST2204 has 48 I/Os grouped into 6 ports, Port-A ~ Port-E

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 the other ports. Port-A/B is designed for

keyboard scan with de-bounce and transition triggered interrupt

at Port-A, while Port-C/D/E/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 ability of driving large LCD panels, up to 320x240, and

hardware/software gray-level support may rich the display

information and the diversity of contents as well. This is done

with no need of external display RAM because of the internal

memory sharing design. The variable LCD buffer design also

make large panel size with little internal RAM possible. User

may free major internal RAM for computing or temporary

access while keeping the display content.

The ST2204 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. 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 two channel PSG/one channel PWM DAC are for

the production of key tone, melody, voice, and speech. Two

dedicated pins with large driving capacity can drive a

buzzer/speaker directly for minimum cost.

The ST2204 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 ST2204 equips Low Voltage

Reset 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.

With these integrated functions inside, the ST2204 single chip

microcontroller is a right solution for PDA, translator, databank

and other consumer products.

Clock

Generator

OSC

Clock

Generator

OSCX

OSCI

OSCXI

OSCXO

XIO

VCC/GND

TEST1/2

Power On

Reset

RESET

A[22:0]

D[7:0]

8-bit

External

Memory

Bus

W R

PSG /

PWM DAC

PSGO/PSGOB

8-bit Static

CPU

ROM

512K bytes

Baud Rate

Generator

DMA

Base Timer

8-bit

SRAM

10K bytes

WDT

Interrupt

Controller

Bank

Control

Logic

PA7~0

Port-A

De-bounce

Logic

Transition

Detector

PB7~0

Port-B

UART with

IrDA Mode

SPI

INTX/PC0

Port-C

SCK/PC1

MISO/PC2

MOSI/PC3

TXD0/PC6

Port-C

RXD0/PC7

Port-C

ICE2/3

Chip Select

Logic

MMD/CS0

Port-D

Timer 0/1

8-bit

Clocking

Output

Port-E

TCO0/PE0

PE7~2

Port-E

LCD

Controller

Port-L

LD[3:0]/PL3~0

CP/PL4

AC/PL5

LOAD1/PL6

FLM/PL7

TXD1/PD6

RXD1/PD7

Port-D

/PC5

DATA_READY

/PC4

/PD4

CS5

/PD5

/A23

CS6

POFF

BLANK

TCO1/PE1

BCO/PE2

PVCC/PGND

XMD

LOAD2

Low Voltage

Detector

VIN

Low Voltage

Reset

/ICE1

LVR

FIGURE 2-1 ST2204 Block Diagram

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