MPC8280 datasheet(762/1386 Pages) FREESCALE

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SCC BISYNC Mode

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

23-8

Freescale Semiconductor

Table 23-5 describes BSYNC fields.

23.8

SCC BISYNC DLE Register (BDLE)

Seen in Figure 23-4, the BDLE register is used to define the BISYNC stripping and insertion of DLE

characters. When an underrun occurs while a message is being sent in transparent mode, the BISYNC

controller inserts DLE-SYNC pairs until the next buffer is available for transmission.

In transparent mode, the receiver discards any DLE character received and excludes it from the BCS if the

valid bit (BDLE[V]) is set. If the second character is SYNC, the controller discards it and excludes it from

the BCS. If it is a DLE, the controller writes it to the buffer and includes it in the BCS. If it is not a DLE

or SYNC, the controller examines the control character table and acts accordingly. If the character is not

in the table, the buffer is closed with the DLE follow character error bit set. If the valid bit is not set, the

receiver treats the character as a normal character. When using 7-bit characters with parity, the parity bit

should be included in the DLE register value.

Table 23-5. BSYNC Field Descriptions

Bits

Name

Description

Valid. If V = 1 and the receiver is not in hunt mode when a SYNC character is received, this character

is discarded.

DIS

Disable BSYNC stripping

0 Normal mode.

1 BSYNC stripping disabled (BISYNC transparent mode only).

2–7

—

All zeros

8–15

SYNC

SYNC character

Field

DIS

DLE

Reset

Undefined

R/W

Addr

SCC Base + 0x40

Figure 23-4. BISYNC DLE (BDLE)

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