tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 44

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2.3 System clock controller
2. CPU Core
RA001
(3)
STOP mode release operation
The STOP mode is released in the following sequence:
Note: When the STOP mode is released with a low hold voltage, the following cautions must be
2. Release by the key-on wakeup
3. Release by the voltage detection circuits
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 opera-
3. After the warm-up time has elapsed, the normal operation is restarted by the instruction that
cuits.
"01" or "10".
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.
age detection circuits, the reset is released and the warm-up starts. After the warm-up is com-
pleted, the NORMAL1 mode becomes active.
interrupt request signals (when VDCR2<VDxMOD> is 0 (x=1 to 2)), the STOP mode is
released when the supply voltage becomes equal to or higher than the detection voltage.
observed.
The supply voltage must be at the operating voltage level before releasing the STOP mode. The
RESET
external time constant circuit has been connected, the
slower pace than the power supply voltage. At this time, there is a danger that a reset may occur
if the input voltage level of the
(Hysteresis input).
lation Start Operation at Release of the STOP Mode".
tions remain stopped during warm-up. The warm-up time is set by the warm-up counter,
depending on the oscillator characteristics.
follows the STOP mode start instruction. At this time, the prescaler and the divider of the
timing generator are cleared to "0".
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".
The STOP mode is released by the supply voltage detection by the voltage detection cir-
To release the STOP mode by using the voltage detection circuits, set VDCR2<VDSS> to
If the voltage detection operation mode of the voltage detection circuits is set to generate
When the supply voltage becomes equal to or higher than the detection voltage of the volt-
If the voltage detection operation mode of the voltage detection circuits is set to generate
For details, refer to the section of the voltage detection circuits.
pin input must also be "H" level, rising together with the supply voltage. In this case, if an
Note:
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.
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.
RESET
Page 30
pin drops below the non-inverting high-level input voltage
RESET
pin input voltage will increase at a
TMP89FM42