Z80181 Datasheet, PDF (44/74 Pages) Zilog, Inc. – SMART ACCESS CONTROLLER (SAC™)

Zilog
REGISTERS FOR SYSTEM CONFIGURATION (Continued)
ECH
76543210
A12
A13
A14
A15
A16
A17
A18
A19
Figure 57. ROM Boundary Register
Z80181
SMART ACCESS CONTROLLER SAC^™
EDH
76543210
PIA1/CTIO
1 PIA1 Functions as CTC's I/O Pins
0 PIA1 Functions as I/O Port
Reserved - Program as 0
ROM Emulator Mode (REME)
1 Data Bus in ROM Emulator Mode
0 Data Bus in Normal Mode
Reserved - Program as 0
Reserved - Program as 0
Disable /ROMCS
1 /ROMCS is Disabled
0 /ROMCS is Enabled
Daisy Chain Configuration
1 IEI Pin-CTC-SCC-IEO Pin
0 IEI Pin-SCC-CTC-IEO Pin
Reserved - Program as 0
Figure 58. System Configuration Register
2-44
DS971800500