Renesas H8SX1664 Informações Técnicas descarregar pdf (Página 18)

Option Link Settings

Reference Function Fitted Alternative (Removed) Related To

R129 Boot Mode Selection

Enables E8 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 unless the following

are corrected:

• FDT programming kernels supplied are rebuilt for the new frequency

• The supplied HMON debugging monitor is updated for baud rate register settings.

The user is responsible for code written to support operating speeds other than the default. See the HMON User Manual for details of

making the appropriate modifications in the code to accommodate different operating frequencies.

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.

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