Technical information

Option Link Settings
Reference Function Fitted Alternative (Removed) Related To
R129 Boot Mode Selection
Enables E8a to control the
boot mode selection.
Allows application control of the
boot mode.
R133
R130 Crystal Selection Fit if 16MHz Crystal Fitted
12MHz Crystal Fitted
R131 Memory Selection Fit to enable SDRAM
Default
R132 Debugging Adaptor Enables Debugging via the E10
adaptor.
Enables Debugging via the E8
adaptor.
R133 Boot Mode Selection Enables Serial Boot Mode
Default
R129
Table 6-6: 2-Pin jumpers
6.7.Oscillator Sources
A crystal oscillator is fitted on the CPU board and used to supply the main clock input to the Renesas microcontroller. A second crystal
oscillator is provided to drive the real time clock. details the oscillators that are fitted and alternative footprints provided on
this CPU board:
Table 6-7
Component
Crystal (X1 Fitted 12MHz (HC49/4H package)
Crystal (X2) Fitted 32.768KHz (90SMX package)
Table 6-7: Oscillators / Resonators
Warning: When replacing the default oscillator with that of another frequency, the debugging monitor will not function.
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, User 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.USB Port
This RSK has a Full-speed (12 Mbps) USB port compliant to USB 2.0 specification. It is available as J12 on the RSK. This port allows Boot
mode programming using USB Direct connection. For more details please refer to H8SX/1663 Group Hardware Manual.
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