z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 162

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

CSI/O Control/Status Register (CNTR: 0AH)
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
TXS
RXS
CSI/O Registers Description
EF
R
7
0
Figure 57.
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.
R/W
CSI/O Control Register:
CNTR (8)
EIE
CSI/O Transmit/Receive
Data Register:
TRDR (8)
6
0
Interrupt Request
CSI/O Block Diagram
R/W
RE
5
0
Internal Address/Data Bus
R/W
TE
4
0
—
3
Family MPU User Manual
R/W
SS2
Baud Rate
Generator
2
1
Phi
UM005003-0703
R/W
SS1
1
1
Z8018x
R/W
CKS
SS0
0
1
147