Z80 datasheet(311/330 Pages) ZILOG

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Z80 Datasheet(PDF) 311 Page - Zilog, Inc.

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Z80 CPU Peripherals

User Manual

UM008101-0601

Serial Input/Output

291

Write Register 7

This register is programmed to contain the receive sync character in the

Monosync mode, a second byte (last eight bits) of a 16-bit sync character in

the Bisync mode, or a flag character (0111 1110) in the SDLC mode. WR7

is not used in the External Sync mode.

Figure 121. Write Register 7

Table29. WriteRegister6 Transmit Sync

Sync 7

Sync 6

Sync 5

Sync 4

Sync 3

Sync 2

Sync 1

Sync 0

Table30. WriteRegister7 ReceiveSync

Sync 15 Sync 14 Sync 13 Sync 12 Sync 11 Sync 10 Sync 9

Sync 8

SYNC Bit 8

SYNC Bit 9

SYNC Bit 10

SYNC Bit 11

SYNC Bit 12

SYNC Bit 13

SYNC Bit 14

SYNC Bit 15

*For SDLC it must be programmed to ‘0111 1110’ for flag recognition

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