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STOP pin
XOUT pin
NORMAL mode
VIH
Warm-up
STOP mode
The STOP mode
is started
by the program.
The STOP mode is released by the hardware
at the rising edge of the STOP pin input.
NORMAL
mode
Note:
If the rising edge is input to the STOP pin within 1 machine cycle after SYSCR1<STOP> is set to "1", the STOP
mode will not be released.
Figure 2-9 Edge-sensitive Release Mode (Example when the high-frequency clock oscillation
circuit is selected)
2. Release by the key-on wakeup
The STOP mode is released by inputting the prescribed level to the key-on wakeup pin.
The level to release the STOP mode can be selected from "H" and "L".
For release by the key-on wakeup, refer to section "Key-on Wakeup".
Note: If the key-on wakeup pin input becomes the opposite level to the release level after the
warm-up starts, the STOP mode is not restarted.
3. Release by the voltage detection circuits
The STOP mode is released by the supply voltage detection by the voltage detection circuits.
To release the STOP mode by using the voltage detection circuits, set VDCR2<SRSS> to
"01" or "10".
If the voltage detection operation mode of the voltage detection circuits is set to generate
reset signals (when VDCR2<VDxMOD> is 1 (x=1 to 2)), the STOP mode is released and a
reset is applied as soon as the supply voltage becomes lower than the detection voltage.
When the supply voltage becomes equal to or higher than the detection voltage of the voltage
detection circuits, the reset is released and the warm-up starts. After the warm-up is completed,
the NORMAL1 mode becomes active.
If the voltage detection operation mode of the voltage detection circuits is set to generate
interrupt request signals (when VDCR2<VDxMOD> is 0 (x=1 to 2)), the STOP mode is re-
leased when the supply voltage becomes equal to or higher than the detection voltage.
For details, refer to the section of the voltage detection circuits.
Note: If the supply voltage becomes equal to or higher than the detection voltage within 1 ma-
chine cycle after SYSCR1<STOP> is set to "1", the STOP mode will not be released.
(3)
STOP mode release operation
The STOP mode is released in the following sequence:
1. Oscillation starts. For the oscillation start operation in each mode, refer to
"Table 2-4 Oscil-2. Warm-up is executed to secure the time required to stabilize oscillation. The internal operations
remain stopped during warm-up. The warm-up time is set by the warm-up counter, depending
on the oscillator characteristics.
3. After the warm-up time has elapsed, the normal operation is restarted by the instruction that
follows the STOP mode start instruction. At this time, the prescaler and the divider of the
timing generator are cleared to "0".
TMP89FH46L
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RA004