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18.5 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.
When switched to the flash memory programming mode, all the pins not used for flash memory programming
become the same status as that immediately after reset. Therefore, all the ports enter the output high-impedance
status, so that pin handling is required when the external device does not acknowledge the output high-impedance
status.
18.5.1 FLMD0 pin
In the normal operation mode, 0 V is input to the FLMD0 pin. In the flash memory programming mode, the V
write voltage is supplied to the FLMD0 pin. The following shows an example of the connection of the FLMD0 pin.
V850ES/SA2, V850ES/SA3
18.5.2 Serial interface pin
The following shows the pins used by each serial interface.
When connecting a dedicated flash programmer to a serial interface pin that is connected to another device on-
board, care should be taken to avoid conflict of signals and malfunction of the other device.
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CHAPTER 18 FLASH MEMORY
Figure 18-5. FLMD0 Pin Connection Example
Dedicated flash programmer connection pin
FLMD0
Table 18-2. Pins Used by Serial Interfaces
Serial Interface
CSI0
CSI0 + HS
UART0
Preliminary User's Manual U15905EJ1V0UD
Pull-down resistor (R
)
FLMD0
Pins Used
SO0, SI0, SCK0
SO0, SI0, SCK0, PDH0
TXD0, RXD0
DD
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