Z80180 Datasheet, PDF (162/326 Pages) Zilog, Inc. – Z8018x Family MPU

Z 8018x Fam ily
M PU Us e r M anual
147
TXS
RXS
Internal Address/Data Bus
Phi
CSI/O Transmit/Receive
Data Register:
TRDR (8)
CSI/O Control Register:
CNTR (8)
Baud Rate
Generator
CKS
Interrupt Request
Figure 57. CSI/O Block Diagram
CSI/O Registers Description
CSI/O Control/Status Register (CNTR: I/O Address 0AH)
CNTR is used to monitor CSI/O status, enable and disable the CSI/O,
enable and disable interrupt generation, and select the data clock speed
and source.
CSI/O Control/Status Register (CNTR: 0AH)
Bit
7
6
5
4
3
Bit/Field
EF
EIE
RE
TE
—
R/W
R
R/W R/W R/W
Reset
0
0
0
0
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
2
1
0
SS2
SS1
SS0
R/W R/W R/W
1
1
1
UM005001-ZMP0400