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Chapter 3
CPU Function
Preliminary User’s Manual U15839EE1V0UM00
3.3 Operation
Modes
3.3.1 Operation
modes
The V850E/CA2 Jupiter has the following operations modes. Mode specification is carried out by the
MODE0 to MODE2 pins.
(1)
Normal operation mode
ROM-less mode
Access to the external ROM is enabled.
In ROM-less mode, after system reset is cleared, each pin related to the bus interface enters the
control mode, program execution branches to the reset entry address of the external ROM and
instruction processing starts.
(2)
Flash memory programming mode
If this mode is specified, it becomes possible to modify (erase, program) the contents of external
flash-memories which are connected to the V850E/CA2 Jupiter device via its external memory
inter-face.
The V850E/CA2 Jupiter device provides a built in Boot-Loader offering the possibility to download
programming algorithms and the new ROM-code itself. To be able to use this feature there’s no
need to have already a dedicated boot software being programmed in the external flash-memory.
It is possible to program external flash-memory devices even in the case that the flash-memory is
completely erased (Support of “Virgin-programming”). The complete Boot-Loader functionality is
provided from the V850E/ CA2 Jupiter device itself. This Boot-Loader is enabled when the so-
called “Flash-Programming Mode” is enabled by a dedicated configuration of the V850E/CA2 Jupi-
ter device’s MODE0 to MODE2 pins.
As an programming interface, the UART0 or the CSI0 serial interface can be selected. The selec-
tion of the interface intended to be used can be done by applying a fixed voltage level (UART0) or
a dedicated amount of pulses (CSI0) to the V850E/CA2 Jupiter device’s MODE 1 pin.
For further information please refer to the document "Preliminary Application Note
EASE-AN-4050".
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