Freescale-semiconductor Microcontrollers Manual do Utilizador descarregar pdf (Página 627)

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ColdFire V1 Full Chip Simulation Connection

FCS Visualization Utilities

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Microcontrollers Debugger Manual

Table 28.13 describes the bits used in the Serial Communication Status Register.

Reading and writing in the BAUD, SCCR1, SCCR2 or SCSR registers has no effect in the

TestTerm component, but are required to make the component compatible with specific

SCI interfaces.

Simulated I/Os of the TestTerm component do not need initialization. In the terminal

interface file termio.c, BAUD and SCSR registers are initialized to be compatible with

real SCI interfaces.

The SCDR register is valid for reading or writing data. Reading a value from the SCDR

while TestTerm is active sets the RDRF flag in the SCSR register and puts the ASCII code

of the typed key into the SCDR register.

Conceptually, writing a new value in the SCDR register by the target application clears the

TDRE flag in SCSR. Transmission completion sets the TDRE flag again. As TestTerm is

only an I/O emulation, no delay is simulated and writing into SCDR sets the TDRE flag in

the SCSR register.

Output Redirection

Output can be redirected to a TestTerm window, a file, or to both at the same time. File

output is monitored by the target system and cannot be specified interactively.

Table 28.12 TestTerm Simulated Memory Mapped Registers

BAUD Baud Rate Control 0x0200

SCCR1 Serial Communication Control Register 1 0x0201

SCCR2 Serial Communication Control Register 2 0x0202

SCSR Serial Communication Status Register 0x0203

SCDR Serial Communication Data Register 0x0204

Table 28.13 TestTerm Serial Communication Status Register

Bit Name (flag) Function Bit Mask Value

TDRE Transmit Data Register Empty 0x80

RDRF Receive Data Register Full 0x20

1 2 ... 622 623 624 625 626 627 628 629 630 631 632 ... 891 892

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