SCF5250LPV100 datasheet(15/56 Pages) FREESCALE

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SCF5250 Data Sheet: Technical Data, Rev. 1.3

Freescale Semiconductor

3.8

Serial Module Signals

The signals described in Table 5 transfer serial data between the two UART modules and the external

peripherals.

3.9

Timer Module Signals

Table 6 describes the Timer module signal which provides an external interface to Timer0.

Table 5. Serial Module Signals

Serial Module Signal

Description

Receive Data

The RXD0/GPIO46 and SDA1/RXD1/GPIO44 are the inputs on which serial data is received by the

DUART. Data is sampled on RxD[1:0] on the rising edge of the serial clock source, with the least

significant bit received first.

Transmit Data

The DUART transmits serial data on the TXD0/GPIO45 and SCL1/TXD1/GPIO10 output signals. Data

is transmitted on the falling edge of the serial clock source, with the least significant bit transmitted (LSB)

first. When no data is being transmitted or the transmitter is disabled, these two signals are held high.

TxD[1:0] are also held high in local loopback mode.

Request To Send

The DDATA3/RTS0/GP104 and DDATA1/RTS1/SDATA2_BS2/GPIO2 request-to-send outputs indicate

to the peripheral device that the DUART is ready to send data and requires a clear-to-send signal to

initiate transfer.

Clear To Send

Peripherals drive the DDATA2/CTS0/GPIO3 and DDATA0/CTS1/SDATA0_SDIO1/GPIO1 inputs to

indicate to the SCF5250 serial module that it can begin data transmission.

Table 6. Timer Module Signals

Serial Module Signal

Description

Timer Output

The SDATAO1/TOUT0/GPIO18 programmable output pulse or toggle on various timer events.

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