CCU 3000, CCU 3000-I
CCU 3001, CCU 3001-I
6. Addendum: CCU 3000, CCU 3000-I EMU Versions
Φ
2-switch
fosc
The CCU 3000 TCs 10, 12, 16, 1, and CCU 3000-I TCs
1 and 3 are emulator versions (EMUs). They differ from
production versions in the programmability of control
register bit 5: If this bit is set to 0, the CCU assumes to
have a clock signal at its X1-pin instead of a crystal con-
nected at pins X1 and X2. X2, in that case, works as a
clock output delivering the inverted processor Φ2 output
signal.
Φ2
3
4
Fig. 6–1: X1, X2
Position shown:
Φ2-switch = 1
XTAL-mode
0201H
Bit
Control Register
Reset
Read
Write
7
copy
x
no function – set to ‘1’ (to keep
compatibility)
from
addr.
FFF9H
6
x
no function – set to ‘1’ (to keep
compatibility)
5
4
PHI2-out: ‘0’ = active, ‘1’ = inactive
PHI2-out: ‘0’ = active, ‘1’ = inactive
external bus: ‘1’ = bus on ports 0, 1, 2
disabled
Bus disable: ‘1’ = disable bus on ports
0, 1, 2
3
2
R/W signal / Port4: ‘0’ = R/W, ‘1’ = P40
R/W signal / Port4: ‘0’ = R/W, ‘1’ = P40
ROM enable: ‘1’ = enable internal ROM
internal ROM: ‘1’ = internal ROM
enabled
1
0
internal RAM: ‘1’ = internal RAM enabled
internal CPU: ‘1’ = internal CPU enabled
RAM enable: ‘1’ = enable internal RAM
CPU enable: ‘1’ = enable internal CPU
MICRONAS INTERMETALL
61
MICRONAS [ MICRONAS ]
