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Reference
Function
R21
Analog Voltage
Source
R46
Analog Voltage
Source
R137
Analog Voltage
Ground
Table 6-12 below describes the function of the option links associated with MCU modes. The default configuration is indicated by BOLD
text.
Reference
Function
R44
MCU Mode,
USB unit
R131
MCU Mode
R130
MCU Mode,
USB unit
R133
MCU Boot mode
6.7. Oscillator Sources
Two crystal oscillators are fitted on the RSK and used to supply the main clock input to the Renesas microcontroller. Table 6-13 details the
oscillators that are fitted and alternative footprints provided on this RSK:
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.
Option Link Settings
Fitted
Analog Voltage Source is set to
on-board Vcc.
Analog Voltage Source is taken from
external connector.
Analog Voltage Ground is routed to
external connector.
Table 6-11: Analog power supply links.
Option Link Settings
Fitted
The CPU is self powered.
Enables SDRAM interface.
USB dedicated clock is
(choose this option if 16 MHz crystal
is used).
Serial Boot Mode is selected.
Table 6-12: MCU mode links.
Component
Crystal (X1)
Fitted
Crystal (X2)
Fitted
Table 6-13: Oscillators / Resonators
Alternative (Removed)
Analog Voltage Source is taken
from external connector.
Analog voltage source is set to
on-board Vcc.
Analog Voltage Ground is
disconnected from external
connector.
Alternative (Removed)
The CPU is power from USB
bus.
Disables SDRAM interface.
USB dedicated clock is
EXTAL × 3
× 4
(choose this option if 12
MHz crystal is used).
USB Boot Mode is selected.
12.0 MHz (HC49/4H package)
32.768 KHz
17
Related To
R46
R21
-
Related To
J10
J14
J13
EXTAL
J16
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