Datasheet

V850ES/JG3 CHAPTER 27 FLASH MEMORY
R01UH0015EJ0300 Rev.3.00 Page 737 of 870
Sep 30, 2010
27.4.6 Pin connection
When performing on-board writing, mount a connector on the target system to connect to the dedicated flash
programmer. Also, incorporate a function on-board to switch from the normal operation mode to the flash memory
programming mode.
In the flash memory programming mode, all the pins not used for flash memory programming become the same status
as that immediately after reset. Therefore, pin handling is required when the external device does not acknowledge the
status immediately after a reset.
(1) FLMD0 pin
In the normal operation mode, input a voltage of V
SS level to the FLMD0 pin. In the flash memory programming
mode, supply a write voltage of VDD level to the FLMD0 pin.
Because the FLMD0 pin serves as a write protection pin in the self programming mode, a voltage of V
DD level must
be supplied to the FLMD0 pin via port control, etc., before writing to the flash memory. For details, see 27.5.5 (1)
FLMD0 pin.
Figure 27-10. FLMD0 Pin Connection Example
V850ES/JG3
FLMD0
Dedicated flash programmer connection pin
Pull-down resistor (R
FLMD0)
(2) FLMD1 pin
When 0 V is input to the FLMD0 pin, the FLMD1 pin does not function. When V
DD is supplied to the FLMD0 pin,
the flash memory programming mode is entered, so 0 V must be input to the FLMD1 pin. The following shows an
example of the connection of the FLMD1 pin.
Figure 27-11. FLMD1 Pin Connection Example
FLMD1
Pull-down resistor (R
FLMD1 )
Other device
V850ES/JG3
Caution If the V
DD signal is input to the FLMD1 pin from another device during on-board writing and
immediately after reset, isolate this signal.