Z80181 Zilog., Z80181 Datasheet - Page 44

• Manufacturer Part Number: Z80181
• Description: SMART ACCESS CONTROLLER (SAC)
• Manufacturer: Zilog.

Zilog
REGISTERS FOR SYSTEM CONFIGURATION (Continued)
2-44
EDH
7
6
Figure 58. System Configuration Register
5
Figure 57. ROM Boundary Register
ECH
4
7
3
6
2
5
1
4
0
3
2
PIA1/CTIO
Reserved - Program as 0
ROM Emulator Mode (REME)
Reserved - Program as 0
Reserved - Program as 0
Disable /ROMCS
Daisy Chain Configuration
Reserved - Program as 0
1
1 PIA1 Functions as CTC's I/O Pins
0 PIA1 Functions as I/O Port
1 Data Bus in ROM Emulator Mode
0 Data Bus in Normal Mode
1 /ROMCS is Disabled
0 /ROMCS is Enabled
1 IEI Pin-CTC-SCC-IEO Pin
0 IEI Pin-SCC-CTC-IEO Pin
0
A12
A13
A14
A15
A16
A17
A18
A19
S
MART
A
CCESS
C
DS971800500
ONTROLLER
Z80181
SAC
™