OSCILLATOR CIRCUITS
KS57C2308/P2308/C2316/P2316
6-8
Table 6-4. Main/Sub Oscillation Stop Mode
Mode
Condition
Method to issue Osc Stop
Osc Stop Release Source
(2)
Main
Oscillation
STOP Mode
Main oscillator runs.
Sub oscillator runs
(stops).
System clock is the
main oscillation clock.
STOP instruction:
Main oscillator stops.
CPU is in idle mode.
Sub oscillator still runs
(stops).
Interrupt and reset:
After releasing stop mode, main
oscillation starts and oscillation
stabilization time is elapsed. And then
the CPU operates.
Oscillation stabilization time is
1 / {256 x BT clock (fx)}.
Set SCMOD.3 to “1”
(1)
Main oscillator stops, halting
the CPU operation.
Sub oscillator still runs
(stops).
Reset:
Interrupt can’t start the main oscillation.
Therefore, the CPU operation can never
be restarted.
Main oscillator runs.
Sub oscillator runs.
System clock is the
sub oscillation clock.
STOP instruction:
(1)
Main oscillator stops.
CPU is in idle mode.
Sub oscillator still runs.
BToverflow and reset:
After the overflow of basic timer [1 /
{256 x BT clock (fxt)}], CPU operation
and main oscillation automatically start.
Set SCMOD.3 to “1”
Main oscillator stops.
CPU still operates.
Sub oscillator still runs.
Set SCMOD.3 to “0” or reset
Sub
oscillation
STOP Mode
Main oscillator runs.
Sub oscillator runs.
System clock is the
main oscillation clock.
Set SCMOD.2 to “1”
Main oscillator still runs.
CPU operates.
Sub oscillator stops.
Set SCMOD.2 to “0” or reset
Main oscillator runs
(stops).
Sub oscillator runs.
System clock is the
sub oscillation clock.
Set SCMOD.2 to “1”
Main oscillator still runs
(stops).
Sub oscillator stops, halting
the CPU operation.
Reset
NOTES
:
1.
This mode must not be used.
2.
Oscillation stabilization time by interrupt is 1 / (256 x BT clocks). Oscillation stabilization time by a reset is 31.3 ms at
4.19 MHz, main oscillation clock.
Summary of Contents for KS57C2308
Page 30: ...ADDRESS SPACES KS57C2308 P2308 C2316 P2316 2 22 NOTES ...
Page 168: ...SAM47 INSTRUCTION SET KS57C2308 P2308 C2316 P2316 5 94 NOTES ...
Page 170: ......
Page 206: ...POWER DOWN KS57C2308 P2308 C2316 P2316 8 8 NOTES ...
Page 210: ...RESET KS57C2308 P2308 C2316 P2316 9 4 NOTES ...
Page 222: ...I O PORTS KS57C2308 P2308 C2316 P2316 10 12 NOTES ...
Page 272: ...LCD CONTROLLER DRIVER KS57C2308 P2308 C2316 P2316 12 24 NOTES ...
Page 280: ...SERIAL I O INTERFACE KS57C2308 P2308 C2316 P2316 13 8 NOTES ...
Page 294: ...MECHANICAL DATA KS57C2308 P2308 C2316 P2316 15 2 NOTES ...
Page 310: ...KS57P2308 P2316 OTP KS57C2308 P2308 C2316 P2316 16 16 NOTES ...
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