CHAPTER 21 RESET FUNCTION
Page 749 of 920
Note 1.
When P130 is set to high-level output before reset is effected, the output signal of P130 can be dummy-output as a reset
signal to an external device, because P130 outputs a low level when reset is effected. To release a reset signal to an
external device, set P130 to high-level output by software.
Note 2.
Reset times (times for release from the external reset state)
After the first release of the POR:
0.672 ms (TYP.), 0.832 ms (MAX.) when the LVD is in use.
0.399 ms (TYP.), 0.519 ms (MAX.) when the LVD is off.
After the second release of the POR:
0.531 ms (TYP.), 0.675 ms (MAX.) when the LVD is in use.
0.259 ms (TYP.), 0.362 ms (MAX.) when the LVD is off.
After power is supplied, a voltage stabilization waiting time of about 0.99 ms (TYP.) and up to 2.30 ms (MAX.) is required
before reset processing starts after release of the external reset.
Note 3.
The state of P40 is as follows.
•
High-impedance during the external reset period or reset period by the POR.
•
High level during other types of reset or after receiving a reset signal (connected to the on-chip pull-up resistance).
Caution
The watchdog timer is also reset without exception when an internal reset occurs.
Reset by LVD circuit supply voltage detection is automatically released when V
DD
≥
V
LVD
after the reset. After reset
processing, execution of the program with the high-speed on-chip oscillator clock as the operating clock starts. For
details, see
Remark
V
LVD
: LVD detection voltage
Содержание RL78/G1H
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