MAC7200 datasheet(716/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

638

Freescale Semiconductor

31.9.2.4

SCI Control Register 3

Address Offset: 0x4

Access: User read/write

6543210

MDIS

FBR

BSTP

IEBERR

RXDMA

TXDMA

BRK13

TXDIR

Reset

10100

000

Figure 31-6. SCI Control Register 3 (SCICR3)

Table 31-8. SCICR3 Field Descriptions

Field

Description

MDIS

Module Disable. By default the module is disabled, and needs to be explicitly turned on here (by writing

a 0 to it) before it can transmit or receive data. For correct operation the module must be turned on before

writing to any of the other registers.

FBR

Fast Bit Error Detection. Handles Bit Error Detection on a per Bit basis. If this is not enabled (compatibility

mode), bit errors will be detected on a per byte basis. (See Section 31.10.4.6, “Fast Bit Error Detection in

LIN mode.”) This bit is only relevant in LIN mode.

BSTP

Bit Error / Physical Bus Error Stop. Causes DMA TX requests to be suppressed, as long as the bit error

and physical bus error flags are not cleared. This stops further DMA writes, which would otherwise cause

data bytes to be interpreted as LIN header information. This bit is only relevant in LIN mode.

IEBERR

Enable Bit Error Interrupt. Generates an interrupt, when a Bit Error is detected.

RXDMA

Activate RX DMA channel. If this Bit is enabled and the eSCI has received data, it will raise a DMA RX

request.

TXDMA

Activate TX DMA channel. Whenever the eSCI is able to transmit data, it will raise a DMA TX request.

BRK13

Break Transmit character length, This bit determines whether the transmit break character is 10 or 11 bit

respectively 13 or 14 bits long. The detection of a framing error is not affected by this bit. LIN 2.0 now

requires that a break character is always 13 bits long, so this Bit should always be set to 1.

0 Break Character is 10 or 11 bit long

1 Break character is 13 or 14 bit long

TXDIR

Transmitter pin data direction in Single-Wire mode. This bit determines whether the TXD pin is going to

be used as an input or output, in the Single-Wire mode of operation. This bit is only relevant in the

Single-Wire mode of operation.

0 TXD pin to be used as an input in Single-Wire mode

1 TXD pin to be used as an output in Single-Wire mode

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