Zilog Z80180 Manuale Utente Pagina 68

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Z8018x
Family MPU User Manual
UM005003-0703
53
CPU Control Register (CCR: 1FH) (Z8S180/L180-Class Processors Only)
Bit 76543210
Bit/Field Clock
Divide
STAND
BY/
IDLE
Enable
BREXT LNPHI STAND
BY/
IDLE
Enable
LNIO LNCPU
CTL
LNAD/
DATA
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0000 0000
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field R/W Value Description
7Clock
Divide
R/W 0
1
XTAL/2
XTAL/1
6STANDBY
/IDLE Mode
R/W
00
01
10
11
In conjunction with Bit 3
No STANDBY
IDLE after SLEEP
STANDBY after SLEEP
STANDBY after SLEEP 64 Cycle Exit (Quick
Recovery)
5 BREXT R/W 0
1
Ignore BUSREQ in STANDBY/IDLE
STANDBY/IDLE exit on BUSREQ
4 LNPHI R/W 0
1
Standard Drive
33% Drive on EXTPHI Clock
3STANDBY
/IDLE Mode
R/W
00
01
10
11
In conjunction with Bit 6
No STANDBY
IDLE after SLEEP
STANDBY after SLEEP
STANDBY after SLEEP 64 Cycle Exit (Quick
Recovery)
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