UPD78F1502AGK-GAK-AX Datasheet, PDF (1009/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
Function
Details of
Function
APPENDIX C LIST OF CAUTIONS
Cautions
(37/39)
Page
Electrical
−
The 78K0R/Lx3 microcontrollers have an on-chip debug function, which is provided p.877 _†
specifications
for development and evaluation. Do not use the on-chip debug function in products
designated for mass production, because the guaranteed number of rewritable times
of the flash memory may be exceeded when this function is used, and product
reliability therefore cannot be guaranteed. Renesas Electronics is not liable for
problems occurring when the on-chip debug function is used.
The pins mounted depend on the product. Refer to 1.3 Pin Configuration (Top View) p.877 _†
and CHAPTER 2 PIN FUNCTIONS.
Absolute
Product quality may suffer if the absolute maximum rating is exceeded even pp.878 _†
maximum ratings momentarily for any parameter. That is, the absolute maximum ratings are rated to 880
values at which the product is on the verge of suffering physical damage, and
therefore the product must be used under conditions that ensure that the absolute
maximum ratings are not exceeded.
The value of the current that can be run per pin must satisfy the value of the current pp.879 _†
per pin and the total value of the currents of all pins.
X1 oscillator
When using the X1 oscillator, wire as follows in the area enclosed by the broken lines p.880 _†
characteristics in the above figures to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current
flows.
• Always make the ground point of the oscillator capacitor the same potential as VSS.
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
Since the CPU is started by the internal high-speed oscillation clock after a reset p.880 _†
release, check the X1 clock oscillation stabilization time using the oscillation
stabilization time counter status register (OSTC) by the user. Determine the
oscillation stabilization time of the OSTC register and oscillation stabilization time
select register (OSTS) after sufficiently evaluating the oscillation stabilization time
with the resonator to be used.
XT1 oscillator When using the XT1 oscillator, wire as follows in the area enclosed by the broken p.881 _†
characteristics lines in the above figures to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating current
flows.
• Always make the ground point of the oscillator capacitor the same potential as VSS.
• Do not ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
The XT1 oscillator is designed as a low-amplitude circuit for reducing power p.881 _†
consumption, and is more prone to malfunction due to noise than the X1 oscillator.
Particular care is therefore required with the wiring method when the XT1 clock is
used.
Recommended The oscillator constants shown above are reference values based on evaluation in a pp.882 _†
oscillator circuit specific environment by the resonator manufacturer. If it is necessary to optimize the , 883
constants
oscillator characteristics in the actual application, apply to the resonator manufacturer
for evaluation on the implementation circuit. The oscillation voltage and oscillation
frequency only indicate the oscillator characteristic. Use the 78K0R/Lx3 so that the
internal operation conditions are within the specifications of the DC and AC
characteristics.
R01UH0004EJ0501 Rev.5.01
993
Jun 20, 2011