Zilog Z80180 - Manual (Page 162)

Z8018x
Family MPU User Manual
UM005003-0703
147
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 2 1 0
Bit/Field EF EIE RE TE — SS2 SS1 SS0
R/W R R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 1 1 1
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Phi
Internal Address/Data Bus
TXS
RXS
Interrupt Request
Baud Rate
Generator
CKS CSI/O Transmit/Receive
Data Register:
TRDR (8)
CSI/O Control Register:
CNTR (8)