CHAPTER 18 FLASH MEMORY
User’s Manual U13850EJ4V0UM
428
18.5 Pin Connection
When performing on-board writing, install a connector on the target system to connect to the dedicated flash
programmer. Also, install 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 the 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 V
PP
pin
In the normal operation mode, 0 V is input to the V
PP
pin. In the flash memory programming mode, a 7.8 V write
voltage is supplied to the V
PP
pin. The following shows an example of the connection of the V
PP
pin.
Figure 18-5. V
PP
Pin Connection Example
V
PP
Dedicated flash programmer connection pin
Pull-down resistor (R
VPP
)
V850/SB1, V850/SB2
18.5.2 Serial interface pin
The following shows the pins used by each serial interface.
Table 18-2. Pins Used in Serial Interfaces
Serial Interface
Pins Used
CSI0
SO0, SI0, SCK0
CSI0
+
HS
SO0, SI0, SCK0, P15
UART0
TXD0, RXD0
When connecting a dedicated flash programmer to a serial interface pin that is connected to other devices on-
board, care should be taken to conflict of signals and malfunction of other devices, etc.