Pin Connection - NEC V850E/Dx3 Preliminary User's Manual

Chapter 6
242
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6.4.3 Pin connection

A connector must be mounted on the target system to connect the flash
programmer for on-board writing. In addition, a function to switch between the
normal operation mode and flash memory programming mode must be
provided on the board.
When the flash memory programming mode is set, all the pins not used for
flash memory programming are in the same status as immediately after reset.
(1) Connection to flash programmer
In the normal operation mode, 0 V is input to the FLMD0 pin. The pull-down
resistor at the FLMD0 pin ensures normal operation mode if no flash
programmer is connected. In the flash memory programming mode, the V
write voltage is supplied to the FLMD0 pin. Additionally the FLMD1 pin, shared
with port P07, has to hold 0 V level.
An example of connection of the FLMD0 and FLMD1 pins is shown below.
Alternatively the FLMD1 pin may also be connected directly to the FLMD1
signal of the flash programmer.
Table 6-3 Operation mode setting
FLMD0
0
1
Figure 6-10 Example of connection to flash programmer PG-FP4
Preliminary User's Manual U17566EE1V2UM00
Pins
Operation mode
FLMD1 (P07)
X Normal operation mode (fetch from flash)
0 Flash programming mode
1 Setting prohibited
PG-FP4
FLMD0
FLMD1
PG-FP4
FLMD0
FLMD1
Flash Memory
DD
µPD70F34xx
FLMD0
FLMD1
µPD70F34xx
FLMD0
FLMD1