Z80189 Datasheet, PDF (49/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
CNTR
Bit EF EIE RE TE -
Upon Reset
R/W
0
0
0
0
1
R R/W R/W R/W
Addr 0AH
SS2 SS1 SS0
1 11
R/W R/W R/W
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
Speed Select
Transmit Enable
Receive Enable
End Interrupt Enable
End Flag
SS2, 1, 0
000
001
010
011
Baud Rate
Ø ÷ 20
Ø ÷ 40
Ø ÷ 80
Ø ÷ 100
SS2, 1, 0
100
101
110
111
Figure 45. CSI/O Control Register
Baud Rate
Ø ÷ 320
Ø ÷ 640
Ø ÷ 1280
External Clock
(Frequency < Ø ÷ 20)
TRDR
Read/Write
Addr 0BH
7 6 54 3 21 0
Read - Received Data
Write - Transmit Data
Figure 46. CSI/O Transmit/Receive Data Register
DS971890301
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