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6.7. Oscillator Sources
A crystal oscillator is fitted on the RSK and used to supply the main clock input to the Renesas microcontroller. details the
oscillators that are fitted and alternative footprints provided on this RS
Table 6-6
K:
Component
Crystal (X1) Fitted 12 MHz (HC49/4H package)
Table 6-6: Oscillators / Resonators
6.8. Reset Circuit
The CPU Board includes a simple latch circuit that links the mode selection and reset circuit. This provides an easy method for swapping
the device between Boot Mode and User mode. This circuit is not required on customer’s boards as it is intended for providing easy
evaluation of the operating modes of the device on the RSK. Please refer to the hardware manual for more information on the
requirements of the reset circuit.
The Reset circuit operates by latching the state of the boot switch on pressing the reset button. This control is subsequently used to
modify the mode pin states as required.
The mode pins should change state only while the reset signal is active to avoid possible device damage.
The reset is held in the active state for a fixed period by a pair of resistors and a capacitor. Please check the reset requirements carefully
to ensure the reset circuit on the user’s board meets all the reset timing requirements.
6.9. Sigma Delta ADC
H8SX/1622 CPU includes six - channel Sigma Delta 16-bit Analog to Digital Converter. The RSK accepts up to two analog inputs. One is
for the single - ended and the second for differential signal. ANDS0_IN connector can be used to connect to single - ended signal.
ANDS4P_IN and ANDS4N_IN connectors can be used for differential signal.
By default, the Sigma Delta ADC is powered from PWR_D connector, but as an option it may have a separate power supply (please refer
to Option Links 6.6 Sigma Delta ADC section) connected to ANALOG_POWER connector (5 volts). Please refer to the silkscreen labels on
the RSK board to avoid connecting a power supply incorrectly.
Warning! Please note that overloading of inputs can cause permanent damage to the CPU and RSK. The maximum ratings for inputs can
be found in section 25 ‘Electrical Characteristics’ of H8SX/1622 Group Hardware Manual.
For more details on H8SX/1622 on-chip Sigma Delta ADC module, please refer to H8SX/1622 Group Hardware Manual.
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