S3C2800 Просмотр технического описания (PDF) - Samsung

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производитель

S3C2800

32-BIT RISC MICROPROCESSOR

Samsung 

S3C2800 MICROCONTROLLER

DATA SHEET

Table 3. S3C2800 Signal Descriptions (Continued)

Signal

I/O

Description

UART

RxD[1:0]

I UART receives data input.

TxD[1:0]

O UART transmits data output.

nCTS[1:0]

I UART clear to send input signal.

nRTS[1:0]

O UART request to send output signal.

IIC-BUS

IICSDA[1:0]

IO

IIC-bus data.

IICSCL[1:0]

IO

IIC-bus clock.

Remote Control Signal Input Interrupt

IRIN

I Remote controller signal receive interrupt

GENERAL-PURPOSE I/O PORTs

GPx[7:0] x 5

GPC[3:0]

IO General-purpose input/output ports

(GPA[7:0], GPB[7:0], GPC[3:0], GPD[7:0] , GPE[7:0], GPF[7:0])

RESET & CLOCK

nRESET

ST nRESET suspends any operation in progress and places S3C2800 into a known reset

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

processor power is stabilized.

nRESET_OUT

O The nRESET_OUT pin is asserted during hardware reset(POR,nRESET), software

reset and watchdog reset.

XTAL0

AI Crystal Input for internal OSC circuit for system clock.

If it isn't used, XTAL0 has to be high level.

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 clocks PLL. (1uF )

XTAL1

AI 32 KHz crystal input for RTC.

EXTAL1

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

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) isn't used, nTRST pin has to be low level 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 has to 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 has to be connected to TDI pin.

TDO

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

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