z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 187

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

172
Free Running counter (FRC: 18H)
UM005003-0703
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Z8018x
Family MPU User Manual
Miscellaneous
7
Free Running Counter (I/O Address =
If data is written into the free running counter, the interval of DRAM
refresh cycle and baud rates for the ASCI and CSI/O are not guaranteed.
In IOSTOP mode, the free running counter continues counting down. It is
initialized to
6
FFH
during RESET.
5
Counting Data
4
R
?
3
18H
)
2
1
0