UPD78F1502AGK-GAK-AX Datasheet, PDF (247/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 5 CLOCK GENERATOR
Notes 1.
2.
3.
4.
The internal reset processing time includes the oscillation accuracy stabilization time of the internal high-
speed oscillation clock.
When releasing a reset, confirm the oscillation stabilization time for the X1 clock using the oscillation
stabilization time counter status register (OSTC).
The microcontroller operates on the 8 MHz internal high-speed oscillation clock if 8 MHz or 20 MHz is
selected for the internal high-speed oscillator by using the option byte or on the 1 MHz internal high-speed
oscillation clock if 1 MHz is selected.
If the internal high-speed oscillator is set to 1 MHz by using the option byte, the 20 MHz internal high-speed
oscillation clock cannot be used.
Cautions 1. A voltage stabilization time (about 2.12 to 5.84 ms) is required after the supply voltage reaches
1.61 V (TYP.). If the time for the supply voltage to rise from 1.61 V (TYP.) to 2.07 V (TYP.) is
shorter than the voltage stabilization time, reset processing is entered after the voltage
stabilization time elapses.
2. It is not necessary to wait for the oscillation stabilization time when an external clock input from
the EXCLK pin is used.
R01UH0004EJ0501 Rev.5.01
231
Jun 20, 2011