M-Station Baseboard
7.4 V
DD
and V
PP
Voltage-Level Options, JP3 and JP4 Settings
With JP2 set to “REG”, VDD_SEL provides V
DD
voltage for the micro-board. The jumpers at JP3 allow
this voltage to be set from 2.0V (with no jumpers connected) up to 5.0V (with JP1 13–14 connected).
Before connecting the M-Station baseboard to a micro-board or target system, refer to the user’s
manuals for the micro-board and MCU and then check that V
DD
is set appropriately for the CPU chip.
Some 78K0 and 78K0S MCUs can operate up to 5.0V, but others have a maximum V
DD
of 3.3V.
Setting V
DD
at a voltage higher than the maximum for the CPU can result in damage to the CPU
chip, micro-board, and/or target system.
When you use the M-Station to flash program a CPU on a micro-board or in a target system, the M-
Station drives V
PP
. Use JP4 to set V
PP
to 5.0V, 6.8V, 7.8V, 8.8V or 10.0V. JP4 should be set to select
the VPP voltage that is appropriate for the chip being programmed. Please refer to the User’s manual
for the micro-board or to the microcontroller device documentation.
Setting V
PP
at a voltage that is
higher than the maximum for the CPU chip can result in damage to the CPU chip. Setting VPP
at a voltage that is lower than the recommended level can result in unsuccessful flash
programming of the device.
Refer to Table 3 and Figure 5 for information about the settings of JP3 and JP4. For the settings of
your micro-board, refer to its companion user’s manual.
7.5
Flash Programming Channel Choices, JP8 and JP9 Settings
The M-Station can flash program NEC Electronics 78K0 or 78K0S MCUs using either the three-wire
serial port method (SIO) or the UART method. The choices available for a particular chip vary. Some
may support both methods, but only one on a certain set of pins. Other devices may only support one
method of flash programming. Please refer to the user’s manuals for the micro-board and MCU.
1. When using the SIO method, set JP8 and JP9 for SIO configuration by connecting pins 2–3
on each of JP8 and JP9.
•
For JP8, this connects the TXD_SO output signal on the flash programming interface to the
SO output on the USB interface, labeled “USO” on the M-Station.
•
For JP9, this connects the RXD_SI input on the flash-programming interface to the SI input
on the USB interface, labeled “USI”.
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