S3C44B0X View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

S3C44B0X

RISC MICROPROCESSOR

Samsung 

PRODUCT OVERVIEW

S3C44B0X RISC MICROPROCESSOR

Table 1-3. S3C44B0X Signal Descriptions (Continued)

Signal

I/O

Description

ADC

AIN[7:0]

AI ADC input[7:0]

AREFT

AI ADC Top Vref

AREFB

AI ADC Bottom Vref

AVCOM

AI ADC Common Vref

GENERAL PORT

P[70:0]

IO General input/output ports (some ports are output mode only)

RESET & CLOCK

nRESET

ST nRESET suspends any operation in progress and places S3C44B0X into a known reset

state. For a reset, nRESET must be held to L level for at least 4 MCLK after the

processor power has been stabilized.

OM[3:2]

I OM[3:2] determines how the clock is made.

00 = Crystal(XTAL0,EXTAL0), PLL on

10, 11 = Chip test mode.

01 = EXTCLK, PLL on

EXTCLK

I External clock source when OM[3:2] = 01b

If it isn't used, it has to be H (3.3V).

XTAL0

AI Crystal Input for internal osc circuit for system clock.

If it isn't used, XTAL0 has to be H (3.3V).

EXTAL0

AO Crystal Output for internal osc circuit for system clock. It is the inverted output of

XTAL0. If it isn't used, it has to be a floating pin.

PLLCAP

AI Loop filter capacitor for system clock PLL. ( 700pF )

XTAL1

AI 32 KHz crystal input for RTC.

EXTAL1

AO 32 KHz crystal output for RTC. It is the inverted output of XTAL1.

CLKout

O Fout or Fpllo clock

JTAG TEST LOGIC

nTRST

I nTRST(TAP Controller Reset) resets the TAP controller at start.

If debugger is used, A 10K pull-up resistor has to be connected.

If debugger(black ICE) is not used, nTRST pin must be at L or low active pulse.

TMS

I TMS (TAP Controller Mode Select) controls the sequence of the TAP controller's

states. A 10K pull-up resistor has to be connected to TMS pin.

TCK

I TCK (TAP Controller Clock) provides the clock input for the JTAG logic.

A 10K pull-up resistor must be connected to TCK pin.

TDI

I TDI (TAP Controller Data Input) is the serial input for test instructions and data.

A 10K pull-up resistor must be connected to TDI pin.

TDO

O TDO (TAP Controller Data Output) is the serial output for test instructions and data.

1-20

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