z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 68

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

CPU Control Register (CCR: 1FH) (Z8S180/L180-Class Processors Only)
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field
7
6
5
4
3
Clock
Divide
STANDBY
/IDLE Mode
BREXT
LNPHI
STANDBY
/IDLE Mode
Divide
Clock
R/W
7
0
STAND
Enable
IDLE
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BY/
6
0
Value Description
BREXT
00
01
10
11
00
01
10
11
R/W
0
1
0
1
0
1
5
0
XTAL/2
XTAL/1
In conjunction with Bit 3
No STANDBY
IDLE after SLEEP
STANDBY after SLEEP
STANDBY after SLEEP 64 Cycle Exit (Quick
Recovery)
Ignore BUSREQ in STANDBY/IDLE
STANDBY/IDLE exit on BUSREQ
Standard Drive
33% Drive on EXTPHI Clock
In conjunction with Bit 6
No STANDBY
IDLE after SLEEP
STANDBY after SLEEP
STANDBY after SLEEP 64 Cycle Exit (Quick
Recovery)
LNPHI
R/W
4
0
STAND
Enable
IDLE
R/W
BY/
3
0
Family MPU User Manual
LNIO
R/W
2
0
LNCPU
UM005003-0703
CTL
R/W
1
0
Z8018x
LNAD/
DATA
R/W
0
0
53