Zilog Z16C35 - Manual (Page 111)

ISCC
User Manual
UM011002-0808
105
Figure 5–37. Write Register 6
5.4.8 Write Register 7 (SYNC Character or SDLC Flag)
WR7 is programmed to contain the receive sync character in the Monosync mode, a sec-
ond byte (the last eight bits) of a 16-bit sync character in the Bisync mode, or a Flag char-
acter (01111110) in the SDLC modes. WR7 may hold the receive sync character or a flag
if one of the special versions of the External Sync mode is selected. WR7 is not used in
Asynchronous mode. Bit positions for WR7 are shown in Figure 5-9.
Figure 5–38. Write Register 7
Write Register 6
D6 D7 D5 D4 D3 D2 D1 D0
Sync7
Sync1
Sync7
Sync3
ADR7
ADR7 Sync6
Sync0
Sync6
Sync2
ADR6
ADR6 Sync5
Sync5
Sync5
Sync1
ADR5
ADR5 Sync4
Sync4
Sync4
Sync0
ADR4
ADR4 Sync3
Sync3
Sync3
1
ADR3
x
Sync2
Sync2
Sync2
1
ADR2
x
Sync1
Sync1
Sync1
1
ADR1
x
Sync0
Sync0
Sync0
1
ADR0
x
Monosync, 8 Bits
Monosync, 6 Bits
Bisync, 16 Bits
Bisync, 12 Bits
SDLC
SDLC (Address Range)
Write Register 7
D6 D7 D5 D4 D3 D2 D1 D0
Sync7
Sync5
Sync15
Sync11 Sync6
Sync4
Sync14
Sync10 Sync5
Sync3
Sync13
Sync9 Sync4
Sync2
Sync12
Sync8 Sync3
Sync1
Sync11
Sync 7 Sync2
Sync0
Sync10
Sync 6 Sync1
x
Sync9
Sync 5 Sync0
x
Sync8
Sync4 Monosync, 8 Bits
Monosync, 6 Bits
Bisync, 16 Bits
Bisync, 12 Bits
SDLC
0 1 1 1 1 1 1 0
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