Samsung KS57C2308 Manual page 200

POWER-DOWN
Mode
System clock Main clock (fx)
Instruction STOP
Clock oscillator Main clock oscillation
stops
Basic timer Basic timer stops.
Serial I/O operates only if
interface external
selected as serial
clock
Timer/counter 0 Operates only if
TCL0 is selected as
counter clock.
Watch timer Operates only if sub
clock (fxt) is selected
as counter clock.
LCD controller Operates only if sub
clock (fxt) is selected
as LCD clock,
LCDCK.
External INT1 and INT2 are
interrupts acknowledged; INT0
is not serviced.
CPU All CPU operations are disabled.
Mode release Interrupt request
signal signals (except INT0)
pre-enabled by IEx or
RESET
NOTES:
1. Sub clock stops by setting SCMOD.2 to "1".
2. Main and sub clock oscillation continues.
8-2
Table 8-1. Hardware Operation During Power-Down Modes
Main Stop
Sub clock (fxt)
Setting SCMOD.2 to
"1"
Sub clock oscillation
stops
Basic timer stops.
operates only if
is external
SCK
selected as serial
clock
Operates only if
TCL0 is selected as
counter clock.
Watch timer stops.
LCD controller stops.
INT0, INT1, and INT2
is not serviced.
Only
input.
Sub Stop Main/Sub Stop
Main clock (fx)
STOP
Main clock oscillation
stops
Basic timer stops.
operates only if
is external
SCK
selected as serial
clock
Operates only if
TCL0 is selected as
counter clock.
Watch timer stops.
LCD controller stops.
INT1 and INT2 are
acknowledged; INT0
is not serviced.
input Interrupt request signals (except INT0)
RESET
pre-enabled by IEx or
KS57C2308/P2308/C2316/P2316
(1)
Main (fx) or sub clock
(fxt)
IDLE
Only CPU clock
(2)
stops.
Basic timer operates.
operates only if a
is clock other than the
SCK
CPU clock is selected
as the serial clock.
Timer/counter 0
operates.
Watch timer
operates.
LCD controller
operates.
INT1 and INT2 are
acknowledged; INT0
is not serviced.
input.
RESET
Idle